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Firefox Release Notes

  • Building on Total Cookie Protection, we've added a more comprehensive logic for clearing cookies that prevents hidden data leaks and makes it easy for users to understand which websites are storing local information. Learn more

  • Firefox now supports logging into Microsoft, work, and school accounts using Windows single sign-on. Learn more

  • The simplify page when printing feature is back! When printing, under More settings > Format select the Simplified option when available to get a clutter-free page. Learn more

  • HTTPS-First Policy: Firefox Private Browsing windows now attempt to make all connections to websites secure, and fall back to insecure connections only when websites do not support it. Learn more

  • We've added a new locale: Scots (sco)

  • The address bar now provides Switch to Tab results also in Private Browsing windows.

  • Firefox now automatically enables High Contrast Mode when "Increase Contrast" is checked on MacOS

  • Firefox now does catch-up paints for almost all user interactions, enabling a 10-20% improvement in response time to most user interactions.

  • Источник: https://www.mozilla.org/en-US/firefox/91.0/releasenotes/
    object is no longer accessible from web content.
  • Improved memory usage and display time when rendering images.
  • Pointer Lock API can now be used outside of fullscreen.
  • CSS3 Flexbox implemented and enabled by default.
  • New Web Notifications API implemented.
  • Added clipboardData API for JavaScript access to a user's clipboard.
  • New built-in font inspector.
  • New HTML5 and elements
  • Fixed: Scrolling using some high-resolution-scroll aware touchpads feels slow.
  • End-of-life 22.0.x product lineon August 6, 2013.

    23.0 August 6, 2013 Official Firefox 23.0 release.[110]

    In this Version Mozilla changed the Firefox Logo.

    • Mixed content blocking enabled to protects users from man-in-the-middle attacks and eavesdroppers on HTTPS pages.
    • Options panel created for Web Developer Toolbox.
    • "Enable JavaScript" preference checkbox has been removed and user-set values will be reset to the default.
    • Improved about:memory's functional UI.
    • Simplified interface for notifications of plugin installation.
    • Enabled DXVA2 on Windows Vista+ to accelerate H.264 video decoding.
    • Users can now switch to a new search provider across the entire browser.
    • CSP policies using the standard syntax and semantics will now be enforced.
    • rendering improvements.
    • Replaced fixed-ratio audio resampler in webrtc.org capture code with Speex resampler and eliminated pseudo-44,000 Hz rate.
    • "Load images automatically" and "Always show the tab bar" checkboxes removed from preferences and reset to defaults.
    • HTML5 form control implemented.
    • Write more accessible pages on touch interfaces with new ARIA role for key buttons.
    • Social share functionality.
    • Added unprefixed requestAnimationFrame.
    • Implemented a global browser console.
    • Dropped blink effect from text-decoration: blink; and completely removed element.
    • New feature in toolbox: Network Monitor.
    23.0.1 August 16, 2013 Off-cycle stability update.[128]

    End-of-life 23.0.x product lineon September 17, 2013.

    Firefox 24 through 30

    Firefox 29 with Australis interface, running on Windows 8.1

    Firefox 24 and Firefox 24 ESR were released on September 17, 2013. The release includes support for the new scrollbar style in Mac OS X 10.7 (and newer), closing tabs to the right, an improved browser console for debugging, and improved SVG rendering, among other things.[129] It is the first version of the browser that uses SpiderMonkey 24.[130]

    Firefox 25 was released on October 29, 2013. Firefox 25 Nightly was at one point slated to include the Australis theme, but Australis did not actually land on Nightly until Firefox 28,[131] did not make it to Firefox 28 Aurora channel, and was finally available with Firefox 29.[132] This release added support for attribute, in CSS, along with Web audio API support, a separate find bar for each tab and many other bug fixes.[133][134][135]

    Firefox 26 was released on December 10, 2013. Firefox 26 changed the behavior of Java plugins to "click-to-play" mode instead of automatically running them. It also added support for H.264 on Linux, password manager support for script-generated fields, and the ability for Windows users without advanced write permissions to update Firefox, as well as many bug fixes and developer-related changes.[136]

    Firefox 27 was released on February 4, 2014. It adds improved Social API and SPDY 3.1 support, as well as enabling of TLS 1.1 and 1.2 by default after having been tested through a toggle in since version 24, released on September 17th, 2013.[137] Also, it brings many bug fixes, security improvements, and developer-related changes.[138]

    Firefox 28 was released on March 18, 2014. It added support for VP9 video decoding and support for Opus in WebM.[139] For Android, features such as predictive lookup from the address bar, quick share buttons and support for OpenSearch were added.[140]

    Firefox 29 was released on April 29, 2014 and includes the Australis interface, it also removes the add-on bar and moves its content to the navigation bar.[141] Additionally, it introduced automatic correction of protocol typos to the address bar, meaning that, for example, is automatically corrected to .[142]

    Firefox 30 was released on June 10, 2014. It adds support for GStreamer 1.0 and a new sidebar button, and most plugins are not activated by default.[143][144]

    Release history of Firefox 24–30
    Version Release date[23]Release type and highlights[t 1]
    24.0 September 17, 2013 Official Firefox 24.0 release.[129]
    • Support for new scrollbar style in Mac OS X 10.7 and newer.
    • Implemented Close tabs to the right.
    • Social: Ability to tear-off chat windows to view separately by simply dragging them out.
    • Accessibility related improvements on using pinned tabs.
    • Removed support for Revocation Lists feature.
    • Performance improvements on New Tab Page loads.
    • Major SVG rendering improvements around Image tiling and scaling.
    • Improved and unified Browser console for enhanced debugging experience, replacing existing Error console.
    • Removed support for sherlock files that are loaded from application or profile directory.
    • Replaced fixed-ratio audio resampler in webrtc.org capture code with Speex resampler and eliminated pseudo-44,000  rate.

    End-of-life 24.0.x product lineon October 29, 2013.

    24.0esr September 17, 2013 Official Firefox 24.0 Extended Support Release (ESR).[129]
    24.1.0esr October 29, 2013 Regular security update.[145]
    24.1.1esr November 15, 2013 Off-cycle stability update.[146]
    • Updated branches that use 4.10 RTM to 4.10.2 RTM.
    • Updated Mozilla to NSS 3.15.3 (new alternative NSS branch) to pick up a few fixes.
    • Fixed an issue where some UI strings in Firefox 24.1.0 ESR l10n builds are in English.
    24.2.0esr December 10, 2013 Regular security update.[147]
    24.3.0esr February 4, 2014 Regular security update.[148]
    24.4.0esr March 18, 2014 Regular security update.[149]
    24.5.0esr April 29, 2014 Regular security update.[150]
    24.6.0esr June 10, 2014 Regular security update.[151]
    24.7.0esr July 22, 2014 Regular security update.[152]
    24.8.0esr September 2, 2014 Regular security update.[153]
    24.8.1esr September 24, 2014 Off-cycle security update.[154]End-of-life 24.x.x ESR product lineon October 14, 2014.
    25.0 October 29, 2013 Official Firefox 25.0 release.[133]
    • Web Audio support.
    • The find bar is no longer shared between tabs.
    • If away from Firefox for months, you now will be offered the option to migrate another browser's history and settings.
    • Resetting Firefox no longer clears your browsing session.
    • CSS3 background-attachment:local support to control background scrolling.
    • Many new ES6 functions implemented.
    • document content can now be specified inline.
    • Fixed blank or missing page thumbnails when opening a new tab.
    25.0.1 November 15, 2013 Off-cycle security and stability update.[155]
    • Fixed pages that sometimes wouldn't load without first moving the cursor.

    End-of-life 25.0.x product lineon December 10, 2013.

    26.0 December 10, 2013 Official Firefox 26.0 release.[136]
    • All Java plug-ins are defaulted to 'click to play'.
    • Password manager now supports script-generated password fields.
    • Updates can now be performed by Windows users without write permissions to Firefox install directory (requires Mozilla Maintenance Service).
    • Support for H.264 on Linux if the appropriate gstreamer plug-ins are installed.
    • Support for MP3 decoding on Windows XP, completing MP3 support across Windows OS versions.
    • CSP implementation now supports multiple policies, including the case of both an enforced and Report-Only policy, per the specification.
    • Social API now supports Social Bookmarking for multiple providers through its SocialMarks functionality.
    • Math.ToFloat32 takes a JavaScript value and converts it to a Float32, whenever possible.
    • There is no longer a prompt when websites use appcache.
    • Support for the CSS image orientation property.
    • New App Manager allows you to deploy and debug HTML5 webapps on Firefox OS phones and the Firefox OS Simulator.
    • IndexedDB can now be used as a "optimistic" storage area so it doesn't require any prompts and data is stored in a pool with LRU eviction policy, in short temporary storage.
    • Fixed: When displaying a standalone image, Firefox matches the Exif orientation information contained within the JPEG image.
    • Fixed: Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1.
    • Improved page load times due to no longer decoding images that are not visible.
    • Fixed: AudioToolbox MP3 backend for Mac OS X.
    26.0.1 December 20, 2013 Off-cycle stability mobile release.[156]
    • Fixed the screen that distorts on some devices after tapping on search suggestion.
    • Fixed: About:home is missing translations in some locales. Most affected are: ca, ga-IE, hu, ko, pt-BR, pt-PT, ro, and uk.
    • Fixed: In some cases, the clip set on the page doesn't update when the addressbar hides.
    • Fixed: Invalid position:fixed rendering.

    End-of-life 26.0.x product lineon February 4, 2014.

    27.0 February 4, 2014 Official Firefox 27.0 release.[138]
    • You can now run more than one service at a time with Firefox SocialAPI, allowing you to receive notifications, chat and more from multiple integrated services.
    • Enabled TLS 1.1 (RFC 4346) and TLS 1.2 (RFC 5246) by default.
    • Added support for SPDY 3.1 protocol.
    • Ability to reset style sheets using .
    • You can now choose to deobfuscate javascript in the debugger.
    • Added support for scrolled fieldsets.
    • Implemented allow-popups directive for iframe sandbox, enabling increased security.
    • CSS cursor keywords -moz-grab and -moz-grabbing have been unprefixed.
    • Added support for ES6 generators in SpiderMonkey.
    • Implemented support for mathematical function in ES6.
    • Dashed line support on Canvas.
    • Had Azure/Skia content rendering working on Linux.
    27.0.1 February 13, 2014 Off-cycle stability release.[157]
    • Fixed stability issues with Greasemonkey and other JavaScript that used ClearTimeoutOrInterval.
    • Fixed: JavaScript math correctness issue.

    End-of-life 27.0.x product lineon March 18, 2014.

    28.0 March 18, 2014 Official Firefox 28.0 release.[139]
    • VP9 video decoding implemented.
    • Mac OS X: Notification Center support for web notifications.
    • Volume control for HTML5 audio/video.
    • Support for Opus in WebM.
    • Now that SPDY/3 is implemented support for SPDY/2 has been removed and servers without SPDY/3 will negotiate to HTTP/1 without any penalty.
    • Support for MathML 2.0 'mathvariant' attribute.
    • Background thread hang reporting.
    • Support for multi-line flexbox in layout.
    28.0.1 March 24, 2014 Android

    Off-cycle stability mobile update.[158]

    • Fixed H.264 video playback issues on several Galaxy devices.
    • Fixed mobile-only security fix for .

    End-of-life 28.0.x product lineon April 29, 2014.

    29.0 April 29, 2014 Official Firefox 29.0 release.[141]
    • Significant new customization mode.
    • A new menu sits in the right hand corner of Firefox and includes popular browser controls.
    • New tabs provide an overall smoother look and fade into the background when not active.
    • An interactive onboarding tour to guide users through the new Firefox changes.
    • Added the ability to set up Firefox Sync by creating a Firefox account.
    • Gamepad API finalized and enabled.
    • Malay [ma] locale added.
    • Clicking on a W3C Web Notification will switch to the originating tab.
    • 'box-sizing' (dropping the -moz- prefix) implemented.
    • Console object available in web workers.
    • Promises enabled by default.
    • SharedWorker enabled by default.
    • implemented and enabled.
    • implemented and enabled.
    • Enabled ECMAScript Internationalization API.
    • Add-on bar has been removed, content moved to navigation bar.
    • No longer possible to move tabs from the top of the browser without an add-on.
    29.0.1 May 9, 2014 Off-cycle stability update.[159]
    • Fixed: An issue with pdf.js printing white pages.
    • Fixed: Tabs not visible with dark themes under Windows 8.1.
    • Fixed: Session Restore failed with a corrupted file.
    • Fixed: Seer disabled by default.

    End-of-life 29.0.x product lineon June 10, 2014.

    30.0 June 10, 2014 Official Firefox 30.0 release.[143]
    • Sidebars button in browser chrome enables faster access to social, bookmark, & history sidebars.
    • Mac OS X command-E sets find term to selected text.
    • Support for GStreamer 1.0.
    • Disallowed calling WebIDL constructors as functions on the web.
    • With the exception of those bundled inside an extension or ones that are whitelisted, plugins will no longer be activated by default.
    • Fixes to box-shadow and other visual overflow.
    • Mute and volume available per window when using WebAudio.
    • Background-blend-mode enabled by default.
    • Use of line-height allowed for .
    • ES6 array and generator comprehensions implemented.
    • Error stack now contains column number.
    • Support for alpha option in canvas context options.
    • Fixed: Ignored autocomplete="off" when offering to save passwords via the password manager.
    • Fixed TypedArrays that don't support new named properties.

    End-of-life 30.0.x product lineon July 22, 2014.

    Firefox 31 through 37

    Firefox 31 and Firefox 31 ESR were released on July 22, 2014. Both versions added search field on the new tab page and were improved to block malware from downloaded files, along with other new features.[160] Firefox 31 ESR is the first ESR to include the Australis interface, unifying the user experience across different Firefox versions. Firefox 24.x.x ESR versions would be automatically updated to ESR version 31 after October 14, 2014.[161]

    Firefox 32 was released on September 2, 2014. It shows off HTTP caching improvements, adds HiDPI/Retina support in the Developer Tools UI and widens HTML5 support, among other things.[162][163]

    Firefox 33 was released on October 14, 2014. It now has off-main-thread compositing (OMTC) enabled by default on Windows (which brings responsiveness improvements),[164]OpenH264 support, search suggestions on about:home and about:newtab, address bar search improvements, session restore reliability improvements, and other changes.[165]

    Firefox 33.1 was released on November 10, 2014, celebrating Firefox's 10-year anniversary.[166][167] Firefox 33.1.1 was released for desktop only on November 14, 2014, fixing a startup crash.[168]

    The logo of Firefox Hello.

    Firefox 34 was released on December 1, 2014. It brings Firefox Hello (a WebRTC client for voice and video chat), an improved search bar, and the implementation of HTTP/2 (draft14) and ALPN, together with other features. It also disables SSLv3, and enables the ability to recover from a locked Firefox process and to switch themes and personas directly in the customization mode.[169]

    Firefox 35 was released on January 13, 2015. It brings support for a room-based conversations model to the Firefox Hello chat service, and other functions, it also includes security fixes.[170]

    Firefox 36 was released for desktop on February 24, 2015, bringing full HTTP/2 support and other smaller improvements and fixes.[171] It was also released for Android three days later on February 27, 2015, adding support for the tablet user interface.[172]

    Firefox 37 was released on March 31, 2015, bringing a heartbeat user rating system, which provides user feedback about the Firefox, and improved protection against website impersonation via OneCRL centralized certificate revocation. Also, Bing search is changed to use HTTPS for secure searching, and added is support for opportunistic encryption of the HTTP traffic where the server supports HTTP/2's AltSvc feature.[173][174]

    Release history of Firefox 31–37
    Version Release date[23]Release type and highlights[t 1]
    31.0 July 22, 2014 Official Firefox 31.0 release.[160]
    • Adds the search field to the new tab page.
    • as default certificate verifier.
    • Blocks malware from downloaded files.
    • Partial implementation of the OpenType MATH table.
    • Support of Prefer:Safe http header for parental control.
    • audio/video .ogg and .pdf files handled by Firefox if no application specified (Windows only).
    • Upper Sorbian [hsb] locale added.
    • Removal of the CAPS infrastructure for specifying site-specific permissions (via preferences). Most notably, attempts to use this functionality to grant access to the clipboard will no longer work. The sole exception is the checkloaduri permission, which may still be used as before to allow sites to load URIs.
    • WebVTT implemented and enabled.
    • CSS3 variables implemented.
    • Developer Tools: Add-on Debugger.
    • Developer Tools: Canvas Debugger.
    • New Array built-in: .
    • New Object built-in: .
    • CSP 1.1 nonce-source and hash-source enabled by default.
    • Developer Tools: Eyedropper tool added to the color picker.
    • Developer Tools: Editable Box Model.
    • Developer Tools: Code Editor improvements.
    • Developer Tools: Console stack traces.
    • Developer Tools: Copy as cURL.
    • Developer Tools: Styled console logs.
    • navigator.sendBeacon enabled by default.
    • Dialogs spawned from the onbeforeunload event no longer block access to the rest of the browser.
    • Fixed: Search for partially selected link text from context menu.
    • Last release for Android 2.2 for ARMv7 devices.

    End-of-life 31.0.x product lineon September 2, 2014.

    31.0esr July 22, 2014 Official Firefox 31.0 Extended Support Release (ESR).[160]
    31.1.0esr September 2, 2014 Regular security update.[175]
    31.1.1esr September 24, 2014 Off-cycle security update.[176]
    31.2.0esr October 14, 2014 Regular security and stability update.[177]
    • Fixed: Invalid certificate issue with .
    • Fixed: Importing an RSA private key fails if p < q.
    31.3.0esr December 1, 2014 Regular security and stability update.[178]
    • Fixed: startup crash.
    • Fixed: Intermittent failures in add-ons manager mochitest-browser tests.
    • Fixed: Bad CPU type in executable running mochitests on Mac OS X Yosemite.
    • Fixed: Error building on Mac OS X Yosemite.
    • Fixed: Build error on Mac OS X Yosemite.
    • Fixed: Wrong CPU features detection on some x86 CPUs.
    • Fixed: should not throw.
    • Last release for Android for ARMv6 devices.
    31.4.0esr January 13, 2015 Regular security update.[179]
    31.5.0esr February 24, 2015 Regular security update.[180]
    31.5.2esr March 20, 2015 Off-cycle security update.[181]
    31.5.3esr March 21, 2015 Off-cycle security update.[182]
    31.6.0esr March 31, 2015 Regular security update.[183]
    31.7.0esr May 12, 2015 Regular security update.[184]
    31.8.0esr July 2, 2015 Regular security update.[185]End-of-life 31.x.x ESR product lineon August 11, 2015.
    32.0 September 2, 2014 Official Firefox 32.0 release.[163]
    • New HTTP cache provides improved performance including crash recovery.
    • Integration of generational garbage collection.
    • Public key pinning support enabled.
    • Displays the number of found items in the find toolbar.
    • Easier back, forward, reload, and bookmarking through the context menu.
    • Views historical use information for logins stored in password manager.
    • Lower Sorbian [dsb] locale added.
    • Removed and turned off trust bit for some 1024-bit root certificates.
    • Performance improvements to Password Manager and Add-on Manager.
    • drawFocusIfNeeded enabled by default.
    • CSS position:sticky enabled by default.
    • mix-blend-mode enabled by default.
    • Vibration API updated to latest W3C spec.
    • box-decoration-break enabled by default.
    • ECMAScript 6 built-in method Array#copyWithin implemented.
    • New Array built-in:
    • navigator.languages property and languagechange event implemented.
    • CSS box-decoration-break replaces -moz-background-inline-policy.
    • HiDPI support in Developer Tools UI.
    • Inspector button moved to the top left.
    • Hidden nodes displayed differently in the markup-view.
    • New Web Audio Editor.
    • Code completion and inline documentation added to Scratchpad.
    • Fixed: Mac OS X: cmd-L does not open a new window when no window is available.
    • Fixed Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1.
    32.0.1 September 10, 2014 (Android)
    September 12, 2014 (desktop)
    Off-cycle stability update.[186]


    • Fixed stability issues for computers with multiple graphics cards.
    • Fixed mixed content icon that may be incorrectly displayed instead of lock icon for SSL sites.
    • Fixed: WebRTC: setRemoteDescription() silently fails if no success callback is specified.


    • Fixed link tap selection that was offset on some Android devices.
    32.0.2 September 18, 2014 Desktop

    Off-cycle stability update.[189]

    • Fixed corrupt installations causing Firefox to crash on update.
    32.0.3 September 24, 2014 Off-cycle security update.[190][191]

    End-of-life 32.0.x product lineon October 14, 2014.

    33.0 October 14, 2014 Official Firefox 33.0 release.[165]
    • Windows: OMTC enabled by default.
    • OpenH264 support (sandboxed).
    • Improved search experience through the location bar.
    • Slimmer and faster JavaScript strings.
    • Search suggestions on the Firefox Start (about:home) and new tab (about:newtab) pages.
    • New CSP (Content Security Policy) backend.
    • Support for connecting to HTTP proxy over HTTPS.
    • Improved reliability of the session restoration.
    • Azerbaijani [az] locale added.
    • Proprietary window.crypto properties/functions removed.
    • JSD (JavaScript Debugger Service) removed in favor of the Debugger interface.
    • @counter-style rule from CSS3 Counter Styles specification implemented.
    • DOMMatrix interface implemented.
    • Cubic-bezier curves editor.
    • Displayed which elements have listeners attached.
    • New sidebar which displays a list of shortcuts to every @media rule in the current stylesheet.
    • Paint flashing for browser content repaints.
    • Editable @keyframes rules in the Rules section of the Inspector.
    • CSS transform highlighter in the style-inspector.
    • Fixed incomplete downloads being marked as complete by detecting broken HTTP1.1 transfers.
    33.0.1 October 24, 2014 Desktop

    Off-cycle stability update.[192]

    • Fixed displaying of a black screen at startup with certain graphics drivers.
    33.0.2 October 28, 2014 Desktop

    Off-cycle stability update.[193]

    • Fixed a startup crash with some combination of hardware and drivers.
    33.0.3 November 6, 2014 Desktop

    Off-cycle stability update.[194]

    • Blacklisted graphics drivers that were causing black screens with OMTC enabled.
    • Fixed two startup crashes with some combination of hardware and drivers.
    33.1 November 10, 2014 Firefox's 10-year anniversary.[166][195]
    • Forget button added.
    • Enhanced tiles.
    • Privacy tour introduced.
    • Adding DuckDuckGo as a search option.
    33.1.1 November 14, 2014 Desktop

    Off-cycle stability update.[196]

    End-of-life 33.x product lineon December 1, 2014.

    34.0 December 1, 2014 Official Firefox 34.0 release.[169]
    • Default search engine changed to Yandex for Belarusian, Kazakh, and Russian locales.
    • Improved search bar (en-US only).
    • Firefox Hello real-time communication client.
    • Easily switch themes/personas directly in the Customizing mode.
    • Wikipedia search now uses HTTPS for secure searching (en-US only).
    • Implementation of HTTP/2 (draft14) and ALPN.
    • Recover from a locked Firefox process in the "Firefox is already running" dialog on Windows.
    • Disabled SSLv3.
    • Proprietary properties/functions re-enabled (to be removed in Firefox 35).
    • Firefox signed by Apple OS X version 2 signature.
    • ECMAScript 6 WeakSet Implemented.
    • JavaScript Template Strings Implemented.
    • CSS3 Font variants and features control (e.g. kerning) implemented.
    • WebCrypto:
      • RSA-OAEP, PBKDF2, ECDH, and AES-KW support.
      • and implemented.
      • Import/export of JWK-formatted keys.
    • matches() DOM API implemented (formerly mozMatchesSelector()).
    • for workers implemented.
    • WebIDE: Create, edit, and test a new Web application from your browser.
    • Highlight all nodes that match a given selector in the Style Editor and the Inspector's Rules panel.
    • Improved User Interface of the Profiler.
    • function added to web console.
    • Fixed: CSS transitions start correctly when started at the same time as changes to display, position, overflow, and similar properties.
    34.0.5 December 1, 2014 Desktop

    Official Firefox 34.0.5 release.[197]

    • Default search engine changed to Yahoo! for North America.

    End-of-life 34.0.x product lineon January 13, 2015.

    35.0 January 13, 2015 Official Firefox 35.0 release.[170]
    • Firefox Hello with new rooms-based conversations model.
    • New search UI improved and enabled for more locales.
    • Access the Firefox Marketplace from the Tools menu and optional toolbar button.
    • Built-in support for H264 (MP4) on Mac OS X Snow Leopard (10.6) and newer through native APIs.
    • Use of tiled rendering on Mac OS X.
    • Improved high quality image resizing performance.
    • Improved handling of dynamic styling changes to increase responsiveness.
    • Implemented HTTP Public Key Pinning Extension (for enhanced authentication of encrypted connections).
    • Added support for the CSS Font Loading API.
    • Resource Timing API implemented.
    • CSS filters enabled by default.
    • Changed JavaScript 'let' semantics to match the ES6 specification.
    • Support for inspecting ::before and ::after pseudo elements.
    • Computed view: Nodes matching the hovered selector are now highlighted.
    • Network Monitor: New request/response headers view.
    • Added support for the EXT_blend_minmax WebGL extension.
    • Fixed: Show DOM Properties context menu item in inspector.
    • Reduced resource usage for scaled images.
    • PDF.js updated to version 1.0.907.
    • Non-HTTP(S) XHR now returns correct status code.

    Changes during Developer Edition releases

    35.0.1 January 26, 2015 (desktop)
    February 5, 2015 (Android)
    Off-cycle stability update.[200][201]
    • Fixed a crash with the Enhanced Steam extension.
    • Fixed a potential startup crash.
    • Fixed Kerberos authentication failure with alias.
    • Fixed SVG / CSS animation regression causing rendering issues on websites like openstreetmap.org.
    • Fixed a crash on Godaddy webmail.
    • Fixed an update failure of document.baseURI to document.location after base tag was removed from DOM for site with a CSP.
    • Fixed a text selection broken with a Right-to-left (RTL) version of Firefox.
    • CSP had a change in behavior with regard to case sensitivity resources loading.


    • Fixed crash with video playback on Asus MeMO Pad 10 and 8, Tesco Hudl, Lenovo Lifetab E models, and several other devices running the Rockchip SoC.

    End-of-life 35.0.x product lineon February 24, 2015.

    36.0 February 24, 2015 (desktop)
    February 27, 2015 (Android)
    Official Firefox 36.0 release.[171][172]
    • Pinned tiles on the new tab page can be synced.
    • Added full support for HTTP/2.
    • Locale added: Uzbek (UZ).
    • Remote option removed.
    • No longer accepting insecure RC4 ciphers whenever possible.
    • Phasing out Certificates with 1024-bit RSA Keys.
    • Shut down hangs will now show the crash reporter before exiting the program.
    • Add-on compatibility changed.
    • Support for the ECMAScript 6 Symbol data type added.
    • Unicode-range CSS descriptor implemented.
    • CSSOM-View scroll behavior implemented allowing smooth scrolling of content without custom libraries.
    • Object-fit and object-position implemented.
    • Isolation CSS property implemented.
    • CSS3 will-change property implemented.
    • Changed JavaScript 'const' semantics to conform better to the ES6 specification.
    • Improved ES6 generators for better performance.
    • Eval sources now appear in the Debugger.
    • DOM Promises inspection.
    • Inspector: More paste options in markup view.
    • CSS gradients work on premultiplied colors.
    • Fixed some unexpected logout from Facebook or Google after restart.
    36.0.1 March 5, 2015 (desktop)
    March 6, 2015 (Android)
    Off-cycle stability update.[202]
    • Disabled the usage of the ANY DNS query type.
    • Fixed a startup crash with EMET.
    • Fixed the Hello contact that may become inactive until restart.
    • Fixed print preferences that may not be preserved.
    • Fixed Hello contact tabs that may not be visible.
    • Accepted hostnames that include an underscore character .
    • Fixed the WebGL that may use significant memory with Canvas2d.
    • Option -remote has been restored.
    • Fixed a top crash.
    36.0.2 March 16, 2015 Android

    Off-cycle stability mobile update.[203]

    • Fixed a startup crash on HTC One M8 devices (Verizon) with Android 5.0.1.
    • Fixed some potential crashes with Flash videos.
    36.0.3 March 20, 2015 Off-cycle security update.[204][citation needed]
    • Security fix for an issue disclosed at HP Zero Day Initiative's Pwn2Own contest.
    36.0.4 March 21, 2015 Off-cycle security update.[205][206]
    • Security fix for an issue disclosed at HP Zero Day Initiative's Pwn2Own contest.

    End-of-life 36.0.x product lineon March 31, 2015.

    37.0 March 31, 2015 Official Firefox 37.0 release.[173][174]
    • Heartbeat user rating system – your feedback about Firefox.
    • Yandex set as default search provider for the Turkish locale.
    • Bing search now uses HTTPS for secure searching.
    • Improved protection against site impersonation via OneCRL centralized certificate revocation.
    • Opportunistically encrypts HTTP traffic where the server supports HTTP/2 AltSvc.
    • Disabled insecure TLS version fallback for site security.
    • Extended SSL error reporting for reporting non-certificate errors.
    • TLS False Start optimization now requires a cipher suite using AEAD construction.
    • Improved certificate and TLS communication security by removing support for DSA.
    • Improved performance of WebGL rendering on Windows.
    • Implemented a subset of the Media Source Extensions (MSE) API to allow native HTML5 playback on YouTube.
    • Added support for CSS display:contents.
    • IndexedDB now accessible from worker threads.
    • New SDP/JSEP implementation in WebRTC.
    • Debug tabs opened in Chrome Desktop, Chrome for Android, and Safari for iOS.
    • New Inspector animations panel to control element animations.
    • New Security Panel included in Network Panel.
    • Debugger panel support for and URIs.
    • Added logging of weak ciphers to the web console.
    37.0.1 April 3, 2015 Off-cycle stability and security update.[207]
    • Disabled HTTP/2 AltSvc introduced in 37.0 due to security issues.


    • Fixed start-up crash due to graphics hardware and third-party software.


    • Fixed crash due to WebRTC usage on certain web sites.
    37.0.2 April 14, 2015 (Android)
    April 20, 2015 (desktop)
    Off-cycle stability and security update.[208][209]


    • Fixed an issue with Google Maps rendering incorrectly in some cases.
    • Fixed stability issues for some graphics hardware and feature sets.
    • Security fixes.


    • Fixed an issue related to the "request desktop site" feature.

    End-of-life 37.0.x product lineon May 12, 2015.

    Firefox 38 through 44

    Both Firefox 38 and Firefox 38 ESR were released on May 12, 2015, with new tab-based preferences, Ruby annotation support and availability of WebSockets in web workers, along with the implementation of the BroadcastChannel API and other features and security fixes.[210]

    Firefox 39 was released on July 2, 2015 for desktop and Android, disabling insecure SSLv3 and RC4, improving performance for IPv6 fallback to IPv4 and including various security fixes.[211][212] Firefox 39.0.3 was released on August 6, 2015, to fix a zero-day exploit.[213]

    Firefox 40 was released on August 11, 2015 for desktop and Android. On Windows 10, the Australis theme was updated to reflect the overall appearance of Windows 10, and the interface is adapted for usability on touchscreens when used in the operating system's "Tablet mode". Firefox 40 includes additional security features, including the filtering of pages that offer potentially unwanted programs, and warnings during the installation of unsigned extensions; in future versions, signing of extensions will become mandatory, and the browser will refuse to install extensions that have not been signed. Firefox 40 also includes performance improvements, such as off-main-thread compositing on Linux.[214][215][216]

    Firefox 41 was released on September 22, 2015 for desktop and Android. Among many additions are the ability to set a profile picture for a Firefox account, enhanced IME support using Text Services Framework, and instant messaging on Firefox Hello.[217][218]

    Firefox 42 was released on November 3, 2015 for desktop and Android. Among many additions are private browsing with tracking protection, IPv6 support in WebRTC, and the ability to view HTML source in a tab.[219][220]

    Firefox 43 was released on December 15, 2015 for desktop and Android. Among many additions are the availability of the 64-bit version for Windows 7 and above, a new strict blocklist, and audio indicators on Android.[221][222]

    Firefox 44 was released on January 26, 2016 for desktop and Android. Among many additions are the improvement of warning pages for certificate errors and untrusted connections, enabling of H.264 and WebM/VP9 video support on systems that don't support MP4/H.264, support for the brotli compression format via HTTPS content-encoding, and the use of Android print service to enable cloud printing.[223][224] "Ask me every time" cookies option was removed without any notifications.[225]

    Release history of Firefox 38–44
    Version Release date[23]Release type and highlights[t 1]
    38.0 May 12, 2015 Official Firefox 38.0 release.[210]
    • New tab-based preferences.
    • Ruby annotation support.
    • Base for the next ESR release.
    • autocomplete=off is no longer supported for username/password fields.
    • URL parser avoids doing percent encoding when setting the Fragment part of the URL, and percent decoding when getting the Fragment in line with the URL spec.
    • RegExp.prototype.source now returns "(?:)" instead of the empty string for empty regular expressions.
    • Improved page load times via speculative connection warmup.
    • WebSocket now available in web workers.
    • BroadcastChannel API implemented.
    • Implemented srcset attribute and <picture> element for responsive images.
    • Implemented DOM3 Events KeyboardEvent.code.
    • Mac OS X: Implemented a subset of the Media Source Extensions (MSE) API to allow native HTML5 playback on YouTube.
    • Implemented Encrypted Media Extensions (EME) API to support encrypted HTML5 video/audio playback (Windows Vista or later only).
    • Automatically downloaded Adobe Primetime Content Decryption Module (CDM) for DRM playback through EME (Windows Vista or later only).
    • Optimized-out variables are now visible in Debugger UI.
    • XMLHttpRequest logs in the web console are now visually labelled and can be filtered separately from regular network requests.
    • WebRTC now has multistream and renegotiation support.
    • copy command added to console.
    38.0esr May 12, 2015 Official Firefox 38.0 Extended Support Release (ESR).[210]
    38.0.1 May 14, 2015 (desktop)
    May 15, 2015 (Android)
    Off-cycle stability update.[226][citation needed][227]


    • Fixed a crash on start-up with first generation NVidia Optimus graphics cards.
    • Fixed a problem in which users who import cookies from Google Chrome can end up with broken websites.
    • Fixed a problem that large animated images may fail to play and may stop other images from loading.
    • Fixed a problem that WebRTC H264 video streams from CiscoSpark native clients are not decoded correctly (Fixed in Firefox ESR 38.0.1; was already fixed in Firefox 38.0).


    • Fixed a crash on start-up on devices for which Firefox does not support Android hardware acceleration.
    • Fixed a problem that large animated images may fail to play and may stop other images from loading.
    • Fixed a problem that Mozilla Location Service (MLS) stumbler may not submit all data.
    38.0.1esr May 14, 2015 Off-cycle stability update.[226]
    38.0.5 June 2, 2015 Official Firefox 38.0.5 release.[228][citation needed][229]


    • Integration of Pocket.
    • Implementation of Reader View.
    • Share the active tab or window in a Hello conversation.
    • Fixed a problem that would cause Firefox to stop painting when switching tabs.
    • Fixed graphics performance when using the built-in VGA driver on Windows 7.


    • Integrated Adjust SDK to measure aggregate installs.
    • Fixed various stability fixes.

    End-of-life 38.0.x product lineon July 2, 2015.

    38.0.6 June 9, 2015 Desktop

    Off-cycle update.

    • Fixes bugs in Firefox 38.0.5 funnelcake builds.

    Note: This release is only available from the Mozilla archives.

    End-of-life 38.0.x product lineon July 2, 2015.

    38.1.0esr July 2, 2015 Regular security update.[230]
    38.1.1esr August 6, 2015 Off-cycle security update.[citation needed]
    38.2.0esr August 11, 2015 Regular security and stability update.[232]
    • Fixed: Firefox may become unresponsive after right-clicking Flash content on Windows 8.
    • Fixed: Firefox may crash during mp4 video playback.
    • Fixed branded Firefox application that does not open URLs in system default browser.
    • Fixed significant memory leak with GreaseMonkey add-on.
    • Fixed crash on browser shutdown.
    • Fixed browser UI that becomes unresponsive state when using Unity Web Player Plugin.
    • Fixed ESRs that would not build on hppa platform.
    • Fixed .
    38.2.1esr August 27, 2015 Off-cycle security update.[233]
    38.3.0esr September 22, 2015 Regular security update.[234]
    38.4.0esr November 3, 2015 Regular security update.[235]
    38.5.0esr December 15, 2015 Regular security update.[236]
    • Improved stability with Java.
    38.5.1esr December 21, 2015 Off-cycle stability update.[237]
    • Preparing to use SHA-256 signing certificate for Windows builds, to meet new signing requirement.
    38.5.2esr December 22, 2015 Off-cycle security and stability update.[238]
    • Use of a SHA-256 signing certificate for Windows builds, to meet new signing requirements.
    38.6.0esr January 26, 2016 Regular security update.[239]
    38.6.1esr February 11, 2016 Off-cycle graphite2 library update.[240]
    • Updated graphite2 library to latest release.
    38.7.0esr March 8, 2016 Regular security update.[241]
    38.7.1esr March 16, 2016 Off-cycle stability update.[242]
    • Fixed an issue in which loading from history can show the wrong url in the location bar.
    • Disabled Graphite font shaping library.
    38.8.0esr April 26, 2016 Regular security update.[243]End-of-life 38.x.x ESR product lineon June 7, 2016.
    39.0 July 2, 2015 Official Firefox 39.0 release.[212][211]
    • Share Hello URLs with social networks.
    • Project Silk for Mac OS X: Smoother animation and scrolling.
    • Support for 'switch' role in ARIA 1.1 (web accessibility).
    • SafeBrowsing malware detection lookups enabled for downloads on Mac OS X and Linux.
    • Support for new Unicode 8.0 skin tone emoji.
    • Removed support for insecure SSLv3 for network communications.
    • Disable use of RC4 except for temporarily whitelisted hosts.
    • The malware detection service for downloads now covers common Mac file types.
    • Performance of displaying dashed lines is improved on Mac OS X.
    • List-style-type now accepts a string value.
    • Enable the Fetch API for network requests from dedicated, shared and service workers.
    • Cascading of CSS transitions and animations now matches the current spec.
    • Implement <link rel="preconnect">allowing anticipation of a future connection without revealing any information.
    • Added support for CSS Scroll Snap Points.
    • Drag and drop enabled for nodes in Inspector markup view.
    • Webconsole input history persists even after closing the toolbox.
    • Cubic bezier tooltip now shows a gallery of timing-function presets for use with CSS animations.
    • localhost is now available offline for WebSocket connections.
    • Improve performance for IPv6 fallback to IPv4.
    • Fixed incomplete downloads being marked as complete by detecting broken HTTP1.1 transfers.
    • Fixed the security state indicator on a page now correctly ignores loads caused by previous pages.
    • Fixed an issue where a Hello conversation window would sometimes fail to open.
    • Fixed a regression that could lead to Flash not displaying has been fixed.
    • Update to NSS 3.19.2.
    39.0.3 August 6, 2015 Off-cycle security update.[213]

    End-of-life 39.0.x product lineon August 11, 2015.

    40.0 August 11, 2015 Official Firefox 40.0 release.[215][216]
    • Support for Windows 10.
    • Added protection against unwanted software downloads.
    • User can receive suggested tiles in the new tab page based on categories Firefox matches to browsing history (en-US only).
    • Hello allows adding a link to conversations to provide context on what the conversation will be about.
    • New style for add-on manager based on the in-content preferences style.
    • Improved scrolling, graphics, and video playback performance with off-main-thread compositing (Linux only).
    • Graphic blocklist mechanism improved: Firefox version ranges can be specified, limiting the number of devices blocked.
    • Add-on extensions that are not signed by Mozilla will display a warning.
    • NPAPI Plug-in performance improved via asynchronous initialization.
    • Smoother animation and scrolling with hardware vsync (Windows only).
    • JPEG images use less memory when scaled and can be painted faster.
    • Sub-resources can no longer request HTTP authentication, thus protecting users from inadvertently disclosing login data.
    • IndexedDB transactions are now non-durable by default.
    • Implemented AudioBufferSourceNode.detune to modulate playback rate in cents, a logarithmic unit of measure used for musical intervals.
    • Improved Performance tools in the developer tools: Waterfall view, Call Tree view and a Flame Chart view.
    • New rules view tooltip in the Inspector to tweak CSS Filter values.
    • Console API messages from SharedWorker and ServiceWorker are now displayed in web console.
    • New page ruler highlighting tool that displays lightweight horizontal and vertical rules on a page.
    • Inspector now searches across all content frames in a page.
    • Fixed Kannada text that does not display properly in built-in pdf viewer.
    40.0.2 August 13, 2015 Desktop

    Off-cycle stability update.[244]

    • Enabled API allowing Windows 10 users to open settings dialog.
    • Fixed mozalloc.lib that was missing from the xulrunner package.
    • Fixed a startup crash with some combination of hardware and drivers.
    40.0.3 August 27, 2015 Off-cycle stability and security update.[245][246]
    • Disabled the asynchronous plugin initialization.
    • Fixed a segmentation fault in the GStreamer support (Linux only).
    • Fixed a startup crash when using DisplayLink (Windows only).
    • Fixed a regression with some Japanese fonts used in the <input> field.
    • Fixed an issue that the selection in a select combox box using the mouse could be broken on some sites.
    • Fixed an issue that some search partner codes were missing.

    End-of-life 40.0.x product lineon September 22, 2015.

    41.0 September 22, 2015 Official Firefox 41.0 release.[219][220]
    • Enhanced IME support on Windows (Vista +) using TSF (Text Services Framework).
    • Ability to set a profile picture for your Firefox Account.
    • Firefox Hello now includes instant messaging.
    • SVG images can be used as favicons.
    • Improved box-shadow rendering performance.
    • WebRTC now requires perfect forward secrecy.
    • WARP is disabled on Windows 7.
    • Updates to image decoding process.
    • Support for running animations of 'transform' and 'opacity' on the compositor thread.
    • MessageChannel and MessagePort API enabled by default.
    • Added support for the transform-origin property on SVG elements.
    • CSS Font Loading API enabled by default.
    • now varies with actual internet connectivity (Windows and Mac OS X only).
    • Copy/Cut Web content from JavaScript to the OS clipboard with .
    • Implemented Cache API for querying named caches that are accessible Window, Worker, and ServiceWorker.
    • Removed support for binary XPCOM components in extensions, use addon SDK "system/child_process" pipe mechanism for native binaries instead.
    • Network requests can be exported in HAR format.
    • Quickly adds new CSS rule with New Rule button in the Inspector.
    • Screenshots a node or element from markup view with the Screenshot Node context menu item.
    • Copies element CSS rule declarations with the Copy Rule Declaration context menu item in the Inspector.
    • Pseudo-Class panel in the Inspector.
    • Fixed an issue where picture element does not react to resize/viewport changes.
    41.0.1 September 30, 2015 Desktop

    Off-cycle stability update.[247]

    • Fixed a startup crash related to Yandex toolbar and Adblock Plus.
    • Fixed potential hangs with Flash plugins.
    • Fixed a regression in the bookmark creation.
    • Fixed a startup crash with some Intel Media Accelerator 3150 graphic cards.
    • Fixed a graphic crash, occurring occasionally on Facebook.
    41.0.2 October 15, 2015 Off-cycle security update.[248]End-of-life 41.0.x product lineon November 3, 2015.
    42.0 November 3, 2015 Official Firefox 42.0 release.[219][220]
    • Private Browsing with Tracking Protection that blocks certain Web elements that could be used to record your behavior across sites.
    • Control Center that contains site security and privacy controls.
    • Indicator added to tabs that play audio with one-click muting.
    • WebRTC improvements:
      • IPV6 support.
      • Preferences for controlling ICE candidate generation and IP exposure.
      • Hooks for extensions to allow/deny createOffer/Answer.
      • Improved ability for applications to monitor and control which devices are used in getUserMedia.
    • Login Manager improvements:
      • Improved heuristics to save usernames and passwords.
      • Editing and showing all logins in line, Copy/Paste usernames/passwords from the Context menu.
      • Migration imports your passwords to Firefox from Google Chrome for Windows and Internet Explorer; import anytime from the Login Manager.
    • Improved performance on interactive websites that trigger a lot of restyles.
    • Implemented ES6 Reflect.
    • Support for ImageBitmap and .
    • Media Source Extension for HTML5 video available for all sites.
    • Viewing HTML source in a tab.
    • Remote website debugging over WiFi (no USB cable or ADB needed).
    • Asynchronous call stacks now allow web developers to follow the code flow through setTimeout, DOM event handlers, and Promise handlers.
    • Configurable Firefox OS Simulator in WebIDE, to simulate reference devices like phones, tablets, even TVs.
    • CSS filter presets in the Inspector.
    • Ability to save filter presets inside CSS Filter Tooltip.

    End-of-life 42.0.x product lineon December 15, 2015.

    43.0 December 15, 2015 Official Firefox 43.0 release.[221][222]
    • Private Browsing with Tracking Protection offers choice of blocking additional trackers.
    • Improved API support for m4v video playback.
    • Firefox 64-bit for Windows is now available via the Firefox download page.
    • Users can choose search suggestions from the Awesome Bar.
    • On-screen keyboard displayed on selecting input field on devices running Windows 8 or greater.
    • Firefox Health Report has switched to use the same data collection mechanism as telemetry.
    • Markup view shows indicators for pseudo-classes locked for elements.
    • Binding F1 key to open the settings when the toolbox is focused.
    • New 'Use in Console' context menu item in Inspector to store selected element in a temporary variable.
    • Search button next to overridden CSS properties to find similar properties in the rules view.
    • Ability to filter styles from their property names in the rules view.
    • Stack traces are now shown for exceptions inside the console.
    • Added ability to display server-side logs in the console.
    • Ability to choose resolution for the GCLI screenshot command.
    • Subresource integrity allows developers to make their sites more secure.
    • Network requests in Console now link to Network panel instead of opening in a popup.
    • Unprefixed 'hyphens' property is now supported.
    • WebIDE now has a sidebar-based UI.
    • The 'transform-origin' property is now supported on SVG elements.
    • Animation inspector now displays animations in a timeline.
    • Single-process mode is no longer supported for NPAPI plugins.
    • Fixed an issue in which the Eyedropper tool does not work as expected when page is zoomed.
    • Various security fixes.
    43.0.1 December 18, 2015 Desktop

    Off-cycle stability update.[249]

    • Preparing to use SHA-256 signing certificate for Windows builds, to meet new signing requirement.
    43.0.2 December 22, 2015 Desktop

    Off-cycle security and stability update.[250]

    • Use of a SHA-256 signing certificate for Windows builds, to meet new signing requirements.
    43.0.3 December 28, 2015 Desktop

    Off-cycle stability update.[251]

    • Fixed network issue when using Nvidia's Network Access Manager.
    • Improved the decoding of some videos on YouTube on some Windows configurations.
    43.0.4 January 6, 2016 Desktop

    Off-cycle stability update.[252]

    • Fix for startup crash for users of a third party antivirus tool.
    • Multi-user Linux download folders can be created.
    • Re-enabled SHA-1 certificates.
    • The last version to support HTTP cookie prompts.

    End-of-life 43.0.x product lineon January 26, 2016.

    44.0 January 26, 2016 Official Firefox 44.0 release.[223][224]
    • Improved warning pages for certificate errors and untrusted connections.
    • Enabled H.264 if system decoder is available.
    • Enabled WebM/VP9 video support on systems that don't support MP4/H.264.
    • In the animation-inspector timeline, lightning bolt icon next to animations running on the compositor thread.
    • Support for the brotli compression format via HTTPS content-encoding.
    • Screenshot commands allow user choice of pixel ratio in Developer Tools.
    • Fixed an issue where Windows XP and Vista screensaver doesn't disable when watching videos.
    • Various security fixes.
    • To support unicode-range descriptor for webfonts, font matching under Linux now uses the same font matching code as other platforms.
    • Use of a SHA-256 signing certificate for Windows builds, to meet new signing requirements.
    • Firefox has removed support for the RC4 decipher.
    • Firefox will no longer trust the Equifax Secure Certificate Authority 1024-bit root certificate or the UTN – DATACorp SGC to validate secure website certificates.
    • Stricter validation of web fonts.
    • On-screen keyboard support temporarily turned off for Windows 8 and Windows 8.1.
    • Right-clicking on a logged object in the console to store it as a global variable on the page.
    • Visual tools for Animation:.
      • View/Edit CSS animation keyframe rules directly in the inspector.
      • Visually modify the cubic-bezier curve that drives the way animations progress through time.
      • Discover and scrub through all CSS animations and transitions playing on the page.
      • Learn more: .
    • Visual tools for Layout and Styles:
      • Display rulers along the viewport to verify size and position and use the measurement tool to easily detect spacing and alignment problems.
      • Use CSS filters to preview and create real-time effects like drop-shadows, sepia, etc..
      • Learn more: .
    • New memory tool for inspecting the memory heap.
    • Service Workers API.
    • Built-in JSON reader to intuitively view, search, copy and save data without extensions.
    • A jump to function definitions in the debugger with Cmd-Click.
    • WebSocket Debugging API and add-on.
    • The rule view now displays styles using their authored text, and edits in the rule view are now linked to the style editor.

    Changes during Nightly releases

    • This and newer versions erase the cookie permissions database of any previous Firefox version.
    44.0.1 February 8, 2016 Desktop

    Off-cycle stability update.[253]

    • Fixed an issue which could lead to the removal of stored passwords under certain circumstances.
    • Allows spaces in cookie names.
    • Requires NSS 3.21.
    • Fixed a crash in cache networking.
    • Fix for using WebSockets in service worker controlled pages.
    • Disabled opus/vorbis audio with H.264.
    • Shipment for the Gecko SDK.
    • Fix for graphics startup crash on Linux.
    44.0.2 February 11, 2016 Off-cycle security and stability update.[254][255]
    • Fixed an issue where Firefox hangs or crashes on startup.

    End-of-life 44.0.x product lineon March 8, 2016.

    Firefox 45 through 51

    Firefox 45 and Firefox 45 ESR were released on March 8, 2016 for desktop (both) and Android (no ESR). Among many additions were Instant Browser sharing through Hello, the addition of Guarani locale, the ability to filter snapshot output in memory tool, and the removal of the Tab Groups (panorama) feature.[256][257]

    Firefox 46 was released on April 26, 2016 for both desktop and Android. Among the many additions were improved security of the JavaScript Just In Time (JIT) Compiler, the GTK3 integration (Linux only), HKDF support for Web Crypto API, and removal of support for Android 3.0 (Android only).[258][259]

    Firefox 47 was released on June 7, 2016 for both desktop and Android. Among the many additions were support for Google's Widevine CDM on Windows and Mac OS X so streaming services like Amazon Video can switch from Silverlight to encrypted HTML5 video; enabling VP9 video codec for users with fast machines; the ability of embedded YouTube videos to play with HTML5 video if Flash is not installed; and the addition of the Latgalian language. It is also the last Firefox version to support Android 2.3.x.[260][261]

    Firefox 48 was released on August 2, 2016 for both desktop and Android. Among the many additions were enhanced download protection and the removal of the Windows Remote Access Service modem Autodial. It was also the first official release with "Electrolysis" (multi-process Firefox, meaning that the interface and web pages are running in separate processes in the computer) was enabled.

    Firefox 48 is the last Firefox version to support Mac OS X Snow Leopard, Mac OS X Lion, and OS X Mountain Lion.[262] Additionally, support for old processors without SSE2 extensions such as the AMD Athlon XP and Pentium III was dropped.[262]

    Firefox 49 was released on September 20, 2016 for both desktop and Android. Among the many additions were an updated Firefox Login Manager, improved video performance for users on systems that support SSE3 without hardware acceleration, added context menu controls to HTML5 audio and video that let users loop files or play files at 1.25x speed, improvements in about:memory reports for tracking font memory usage, and the removal of Firefox Hello.[263][264] The macOS version now requires at least OS X Mavericks, and the Microsoft Windows version requires a CPU which supports SSE2.[262]

    Firefox 50 was released on November 15, 2016 for both desktop and Android. Among the many additions were playback video on more sites without plugins with WebM EME Support for Widevine on Windows and Mac, improved performance for SDK extensions or extensions using the SDK module loader; download protection for a large number of executable file types on Windows, Mac OS, and Linux, increased availability of WebGL to more than 98 percent of users on Windows 7 and newer (desktop), and support for HLS videos via player overlay (Android).[265][266]

    Firefox 51 was released on January 24, 2017 for both desktop and Android. Among the many additions were added support for FLAC (Free Lossless Audio Codec) playback, better Tab Switching, support for WebGL 2, and a warning that is displayed when a login page does not have a secure connection.[267][268]

    Release history of Firefox 45–51
    Version Release date[23]Release type and highlights[t 1]
    45.0 March 8, 2016 Official Firefox 45.0 release.[256][257]
    • Instant browser tab sharing through Hello.
    • Tabs synced via Firefox Accounts from other devices are now shown in dropdown area of Awesome Bar when searching.
    • Synced Tabs button in button bar.
    • Introduces a new preference to allow blocking at the DNS level.
    • Guarani [gn] locale added.
    • URLs containing a Unicode-format Internationalized Domain Name (IDN) are now properly redirected.
    • Various security fixes.
    • Tab Groups (Panorama) feature removed.
    • Ability to filter snapshot output in memory tool.
    • Fine-tuning animations by changing the playback rate of animations in the animation-inspector's timeline.
    • DOMContentLoaded and load events shown in the network monitor timeline.
    • Added Negative url filtering for the network monitor.
    • Support for diffing heap snapshots added to the memory tool.
    • Inspector search now matches results from all content in the page, including subframes.
    • List of animated properties and keyframes is now displayed when clicking on an animation in the animation-inspector's timeline.
    • Push API support, part of Progressive Web Applications.
    • Support for delivery of a Content Security Policy (CSP) via a meta tag.
    • Web Speech synthesis API.
    • ES6 Classes.
    45.0.1 March 16, 2016 Off-cycle stability update.[269][270]
    • Fix for a potential performance regression (YouTube for example).
    • Fix for a regression causing search engine settings to be lost in some context.
    • Brings back non-standard jar: URIs to fix a regression in IBM iNotes.
    • Fixed an issue in which was failing when was used.
    • Fix for an issue which could cause the list of search provider to be empty.
    • Fix for a regression when using the location bar.
    • Fix for some loading issues when Accept third-party cookies: was set to Never.
    • Disabled Graphite font shaping library.
    45.0.2 April 11, 2016 Off-cycle stability update.[271][272]
    • Fix for an issue impacting the cookie header when third-party cookies are blocked.
    • Fix for a web compatibility regression impacting the srcset attribute of the image tag.
    • Fix for a crash impacting the video playback with Media Source Extension.
    • Fix for a regression impacting some specific uploads.


    • Fix for a regression with the copy and paste with some old versions of some Gecko applications like Thunderbird.


    • Last release for Android 3.x

    End-of-life 45.0.x product lineon April 26, 2016.

    45.0esr March 8, 2016 Official Firefox 45.0 Extended Support Release (ESR).
    45.0.1esr March 16, 2016 Off-cycle stability update.[273]

    Same changelog of 45.0.1

    45.0.2esr April 11, 2016 Off-cycle stability update.[273]

    Same changelog of 45.0.2

    45.1.0esr April 26, 2016 Regular security and stability update.[274]
    45.1.1esr May 3, 2016 Off-cycle stability update.[275]
    • Fixed a build issue when jit is disabled.
    • Fixed add-on signing certificate expiration.
    • Fixed a graphics-related shutdown crash.
    45.2.0esr June 7, 2016 Regular security and stability update.[276]
    • Fixed graphics-related crashes.
    • Fixed unicode support for AutoConfig API.
    • Web compatibility fix for addEventListener API.
    45.3.0esr August 2, 2016 Regular security and stability update.[277]
    45.4.0esr September 20, 2016 Regular security update.[278]
    45.5.0esr November 15, 2016 Regular security update.[279]
    45.5.1esr November 30, 2016 Off-cycle security update.[280]
    45.6.0esr December 13, 2016 Regular security update.[281]
    45.7.0esr January 24, 2017 Regular security update.[282]
    45.8.0esr March 7, 2017 Regular security update.[283]
    45.9.0esr April 19, 2017 Regular security update.[284]End-of-life 45.x.x ESR product lineon June 13, 2017.
    46.0 April 26, 2016 Official Firefox 46.0 release.[258][259]
    • Improved security of the JavaScript Just In Time (JIT) Compiler
    • GTK3 integration (Linux only)
    • Screen reader behavior with blank spaces in Google Docs corrected
    • Corrected rendering for scaled SVGs that use a clip and a mask
    • WebRTC fixes to improve performance and stability
    • Display of dominator trees in Memory tool
    • Allocation and garbage collection pause profiling in the performance panel
    • Launch of responsive mode from the Style Editor sidebar
    • Added support for
    • Added HKDF support for Web Crypto API[citation needed]
    46.0.1 May 3, 2016 Off-cycle stability update.[285][286]
    • Fixed add-on signing certificate expiration.
    • Fixed service worker update issue.
    • Fixed a build issue when jit is disabled.
    • Fixed a page loading issue related to antivirus software.
    • Searched a plugin issue for various locales.
    • Limited Sync registration updates.

    End-of-life 46.0.x product lineon June 7, 2016.

    47.0 June 7, 2016 Official Firefox 47.0 release.[260][261]
    • Support for Google's Widevine CDM on Windows and Mac OS X so streaming services like Amazon Video can switch from Silverlight to encrypted HTML5 video.
    • Enabled VP9 video codec for users with fast machines
    • Embedded YouTube videos now play with HTML5 video if Flash is not installed.
    • Ability to view and search open tabs from your smartphone or another computer in a sidebar
    • Allowed no-cache on back/forward navigations for https resources
    • Latgalu [ltg] locale added.
    • Various security fixes
    • FUEL (Firefox User Extension Library) has been removed. Add-ons relying on it will stop working.
    • The preference has been reset to its default value (true) to avoid e10s performance problems.
    • The Firefox click-to-activate plugin whitelist has been removed.
    • Web platform changes
    • Ability to view, start, and debug registered Service Workers in the Service Workers developer tool
    • Ability to simulate Push messages in the Service Workers developer tool
    • 'Start' button for service workers in about:debugging to start registered Service Workers
    • Changes that can affect add-on compatibility
    • Added support for ChaCha20/Poly1305 cipher suites
    • Custom user agents supported in Responsive Design Mode
    • Smart multi-line input in the Web Console
    • cuechange events are now available on TextTrack objects
    • WebCrypto: PBKDF2 supports SHA-2 hash algorithms
    • WebCrypto: RSA-PSS signature support


    • Last release to support Android 2.3.x (Gingerbread)
    47.0.1 June 28, 2016 Desktop

    Off-cycle stability update.[287]

    • Fixed an issue in which Selenium WebDriver may cause Firefox to crash at startup.
    47.0.2 November 1, 2016 Off-cycle stability update.[288]
    • Detect SSE hardware version.
    • Detect Websense to protect users from a startup crash.

    End-of-life 47.0.x product lineon November 1, 2016.

    48.0 August 2, 2016 Official Firefox 48.0 release.[262]
    • Roar for moar protection against harmful downloads! We've got your back.
    • Process separation (e10s) is enabled for some of you. Like it? Let us know and we'll roll it out to more.
    • Add-ons that have not been verified and signed by Mozilla will not load.
    • Linux fans: Get better Canvas performance with speedy Skia support. Try saying that three times fast.
    • WebRTC embetterments:
      • Delay-agnostic AEC enabled.
      • Full duplex for Linux enabled.
      • ICE Restart & Update is supported.
      • Cloning of MediaStream and MediaStreamTrack is now supported.
    • Searching for something already in your bookmarks or open tabs? We added super smart icons to let you know.
    • Tab (move buttons) and Shift+F10 (pop-up menus) now behave as they should in Firefox customization mode (Windows only).
    • The media parser has been redeveloped using the Rust programming language.
    • Heyo, Jabra & Logitech C920 webcam users. Fixed WebRTC bugs causing frequency distortions.
    • Improved step debugging on last line of functions.
    • After version 48, SSE2 CPU extensions are going to be required on Windows.
    • Au revoir to Windows Remote Access Service modem Autodial.
    • WebExtensions support is now considered as stable.
    • Want to move absolute & fixed positioned elements? Now you can with our geometry editor.
    • The memory tool now has a tree map view for your debugging pleasure.
    • We're putting the spotlight on the background. Now you can debug WebExtensions background content scripts and background pages.
    • Content Security Policy (CSP) is now enforced for WebExtensions.
    • Old and busted: Error Console. New hotness: Browser Console for your debugging pleasure.
    • Add-on development just got easier because you can reload them from about:debugging – because we're all about debugging.
    • This theme is hot, hot, hot! Say hi to the Firebug theme for Developer Tools.
    • Expanded network requests from the console panel to view request details in line, so you can see things in context.
    • Workers can now use the Web Crypto API.
    48.0.1 August 18, 2016 Desktop

    Off-cycle stability update.[289]

    • Fix for an audio regression impacting some major websites.
    • Fix for a top crash in the JavaScript engine.
    • Fix for a startup crash issue caused by Websense.
    • Fix for a different behavior with e10s / non-e10s on <select> and mouse events.
    • Fix for a top crash caused by plugin issues.
    • Fix for an unsigned add-ons issue on Windows.
    • Fix for a shutdown issue.
    • Fix for a crash in WebRTC.
    48.0.2 August 24, 2016 Desktop

    Off-cycle stability update.[290]

    • Fix for a startup crash issue caused by Websense (Windows only).
    • Last release for Mac OS X 10.6-10.8.

    End-of-life 48.0.x product lineon September 20, 2016.

    49.0 September 20, 2016 Official Firefox 49.0 release.[263][264]
    • Updated Firefox Login Manager to allow HTTPS pages to use saved HTTP logins. It's one more way Firefox is supporting Let's Encrypt and helping users transition to a more secure web.
    • Added features to Reader Mode that make it easier on the eyes and the ears.
      • Controls that allow users to adjust the width and line spacing of text.
      • Narrate, which reads the content of a page out loud.
    • Improved video performance for users on systems that support SSSE3 without hardware acceleration.
    • Added context menu controls to HTML5 audio and video that let users loops files or play files at 1.25x speed.
    • Improved performance on OS X systems without hardware acceleration.
    • Improved appearance of anti-aliased OS X fonts.
    • Improvements in about:memory reports for tracking font memory usage.
    • Improved performance on Windows systems without hardware acceleration.
    • Fixed an issue that prevented users from updating Firefox for Mac unless they originally installed Firefox. Now, those users as well as any user with administrative credentials can update Firefox.
    • Ended Firefox for Mac support for OS X 10.6, 10.7, and 10.8.
    • Ended Firefox for Windows support for SSE processors.
    • Removed Firefox Hello.
    • Re-enabled the default for Graphite2 font shaping.
    • Added a Cause column to the Network Monitor to show what caused each network request.
    • Introduced web speech synthesis API.
    49.0.1 September 23, 2016 Desktop

    Off-cycle stability update.[291]

    • Mitigated a startup crash issue caused by Websense (Windows only).
    49.0.2 October 20, 2016 Off-cycle security and stability update.[292][293]
    • Asynchronous rendering of the Flash plugins for desktop is now enabled by default. This should improve performance and reduce crashes for sites that use the Flash plugin.
    • Changed D3D9 default fallback preference to prevent graphical artifacts.
    • Fixed a network issue that prevents some users from seeing the Firefox UI on startup.
    • Fixed a web compatibility issue with
    • Fixed a web compatibility issue with file uploads on Android.
    • Diagnostic information on timing for tab switching.
    • Fix for a Canvas filters graphics issue affecting HTML5 apps.

    End-of-life 49.0.x product lineon November 15, 2016.

    50.0 November 15, 2016 Official Firefox 50.0 release.[265][266]
    • Playback video on more sites without plugins with WebM EME Support for Widevine on Windows and Mac.
    • Improved performance for SDK extensions or extensions using the SDK module loader.
    • Added download protection for a large number of executable file types on Windows, Mac and Linux.
    • Increased availability of WebGL to more than 98 percent of users on Windows 7 and newer.
    • Added Guarani (gn) locale.
    • Added option to Find in page that allows users to limit search to whole words only.
    • Updates to keyboard shortcuts.
      • Set for a preference to have Ctrl+Tab cycle through tabs in recently used order.
      • View for a page in Reader Mode by using Ctrl+Alt+R (Command+Alt+R on Mac).
    • Various security fixes.
    • Blocked versions of libavcodec older than 54.35.1.
    • Added a built-in Emoji set for operating systems without native Emoji fonts (Windows 8.0 and lower and Linux).
    • Changes for web developers.


    • Added support for HLS videos via player overlay.
    • Simplified the user interface by combining the Recent Tabs and History panels.
    50.0.1 November 28, 2016 Desktop

    Off-cycle security and stability update.[294]

    • Fixed an issue where Firefox crashes with 3rd party Chinese IME when using IME text.
    50.0.2 November 30, 2016 Off-cycle security update.[295][296]
    • Fixed a zero-day exploit in the wild among other exploits.
    50.1.0 December 13, 2016 Regular security update.[297][298]

    End-of-life 50.x.x product lineon January 24, 2017.

    51.0 January 24, 2017 Official Firefox 51.0 release.[267][268]
    • Added support for FLAC (Free Lossless Audio Codec) playback.
    • Improved reliability of browser data sync.
    • An even faster E10s! Tab Switching is better!
    • Added Georgian (ka) and Kabyle (kab) locales.
    • A warning is displayed when a login page does not have a secure connection.
    • Added support for WebGL 2, with advanced graphics rendering features like transform feedback, improved texturing capabilities, and a new sophisticated shading language.
    • Firefox will save passwords even in forms that do not have "submit" events.
    • Improved video performance for users without GPU acceleration for less CPU usage and a better full screen experience.
    • Added a zoom button in the URL bar:
      • Displays percent above or below 100 percent when a user has changed the page zoom setting from the default.
      • Lets users return to the default setting by clicking on the button.
    • Users can view passwords in the save password prompt before saving them.
    • Removed Belarusian (be) locale.
    • Various security fixes.
    • Updated to NSS 3.28.1.
    • Re-enabled E10s support for Russian (ru) locale.
    • Use of 2D graphics library (Skia) for content rendering on Linux.


    • Added Nepali (ne-NP), Bulgarian (bg) and Kabyle (kab) locales.
    51.0.1 January 26, 2017 Desktop

    Off-cycle security and stability update.[299]

    • Fixed an issue in which multiprocess incompatibility did not correctly register with some add-ons.
    • Fixed an issue in which geolocation was not working on Windows.
    51.0.2 February 6, 2017 Android

    Off-cycle stability update.[300]

    • Fix for a crash caused by an Android library (Palette) on some x86 devices.
    51.0.3 February 9, 2017 Android

    Off-cycle stability update.[301]

    • Fix for a build issue which was causing some crashes on some x86 architectures.

    End-of-life 51.0.x product lineon March 7, 2017.

    Firefox 52 through 59

    Logo used from Firefox 57 to Firefox 69

    Logo used from Firefox 57 to Firefox 69

    Firefox 52 and Firefox 52 ESR were released on March 7, 2017 for desktop (both) and Android (no ESR). An important aspect of Firefox ESR 52.0 is that it is the first ESR version based on Firefox Electrolysis (Firefox 48) code base. Firefox 52 added support for WebAssembly

    Источник: https://en.wikipedia.org/wiki/Firefox_version_history

    Firefox version history

    Wikimedia list article

    Firefox was created by Dave Hyatt and Blake Ross as an experimental branch of the Mozilla browser, first released as Firefox 1.0 on November 9, 2004. Starting with version 5.0, a rapid release cycle was put into effect, resulting in a new major version release every six weeks. This was gradually accelerated further in late 2019, so that new major releases occur on four-week cycles starting in 2020.[3]Firefox 94 is the latest version; it was released on November 2, 2021.

    Current and future releases

    Current supported official releases

    Current supported test releases

    Future official releases


    Early versions

    Main article: Firefox early version history

    Rapid releases

    In April 2011, the development process was split into several "channels", each working on a build in a different stage of development. The most recent available build is called "Nightly Builds" and offers the latest, untested features and updates. The "Aurora" build is up to six weeks behind "Nightly" and offers functionality that has undergone basic testing. As of version 35, the "Aurora" channel has been renamed to the "Developer Edition" channel.[4][5] The "Beta" channel is up to six weeks behind the "Aurora" build, for up to about twelve weeks compared to the most recent "Nightly" build. The "Beta" channel provides improved stability over the "Nightly" builds and is the first development milestone that has the "Firefox" logo. "Release" is the current official version of Firefox. Gecko version numbering is the same as the Firefox build version number, starting with 5.0 on Firefox 5.

    The stated aim of this faster-paced process is to get new features to users faster.[6] This accelerated release cycle was met with criticism by users, as it often broke add-on compatibility,[7] as well as those who believe Firefox was simply trying to increase its version number to compare with other browsers such as Google Chrome.[8]

    Firefox 5 through 9

    Firefox 5 was released on June 21, 2011,[9] three months after the major release of Firefox 4. Firefox 5 is the first release in Mozilla's new rapid release plan, matching Google Chrome's rapid release schedule and rapid version number increments.[10] Firefox 5 has significantly improved the speed of web-related tasks, such as loading pages with combo boxes or MathML. Mozilla also integrated the HTML5 videoWebM standard into the browser, allowing playback of WebM videos.[11]

    Firefox 6 was released on August 16, 2011, introducing a permissions manager, new address bar highlighting (the domain name is black while the rest of the URL is gray[12]), streamlining the look of the site identity block, a quicker startup time, a ScratchPad JavaScript compiler, and many other new features. This update also brought the infamous feature that caused JavaScript entered in the address bar to not run.[13]

    Firefox 7 was released on September 27, 2011,[14] and uses as much as 50% less RAM than Firefox 4 as a result of the MemShrink project to reduce Firefox memory usage.[15][16][17]

    Firefox 7.0.1 was released a few days later, fixing a rare, but serious, issue with add-ons not being detected by the browser.[18] Some URLs are trimmed in the address bar, so the "http://" scheme no longer appears, but "https://" is still displayed. Trailing slashes on domains are also hidden, for example: https://www.example.org/ becomes https://www.example.org.[12][19]

    Firefox 8 was released on November 8, 2011[20] and prompts users about any previously installed add-ons. Upon installation, a dialog box prompted users to enable or disable the add-ons. Add-ons installed by third-party programs were disabled by default, but user-installed add-ons were enabled by default. Mozilla judged that third-party-installed add-ons were problematic, taking away user control, lagging behind on compatibility and security updates, slowing down Firefox startup and page loading time, and cluttering the interface with unused toolbars.[21]

    Firefox 9 was released on December 20, 2011, includes various new features such as Type Inference, which boosts JavaScript performance up to 30%, improved theme integration for Mac OS X Lion, added two-finger swipe navigation for Mac OS X Lion, added support for querying Do Not Track status via JavaScript, added support for font-stretch, improved support for text-overflow, improved standards support for HTML5, MathML, and CSS, and fixed several security problems. It also features a large list of bug fixes.[22]

    Release history of Firefox 5–9
    Version Release date[23]Release type and highlights[t 1]
    5.0 June 21, 2011 Official Firefox 5.0 release.[9]
    • Better standards support for HTML5, CSS3, MathML, XHR, and SMIL
    • Better visibility for the Do not track header preference[24]
    • Stability and security improvements[25][26][27]
    • Better tuned HTTP idle connection logic[24]
    • Improved canvas, JavaScript, memory, and networking performance
    • Improved spell checking for some locales
    • Improved desktop environment integration for Linux users
    • Better WebGL security (WebGL content can no longer load cross-domain textures).[28]
    • Background tabs have setTimeout and setInterval clamped to 1000 ms to improve performance[29]
    • Gecko version number bumped to 5.0 to match (and from then on stay synced to) Firefox's major version number.[30]
    • Added support for CSS animations.
    • The Do-Not-Track header preference has been moved to increase discoverability.
    • Tuned HTTP idle connection logic for increased performance.
    • Improved canvas, JavaScript, memory, and networking performance.
    • Improved standards support for HTML5, XHR, MathML, SMIL, and canvas.
    • Improved spell checking for some locales.
    • Improved desktop environment integration for Linux users.
    • WebGL content can no longer load cross-domain textures.
    • Background tabs have and clamped to 1000 ms to improve performance.
    5.0.1 July 11, 2011 Off-cycle stability update for Mac OS X only.
    • Fixed an issue in Mac OS X 10.7 that could cause Firefox to crash[31]
    • Fixed an issue caused by Apple's "Java for Mac OS X 10.6 Update 5" where the Java plugin would not be loaded[32]

    End-of-life 5.0.x product lineon August 16, 2011.

    6.0 August 16, 2011 Official Firefox 6.0 release.[13]
    • about:permissions, a permissions manager. The user can choose what information can be shared with sites, e.g. location.
    • The address bar now highlights the domain of the website you're visiting.
    • Streamlined the look of the site identity block.
    • Added support for the latest draft version of WebSockets with a prefixed API.
    • Added support for EventSource / server-sent events.
    • Added support for .
    • Added Scratchpad, an interactive JavaScript prototyping environment.
    • Added a new Web Developer menu item and moved development-related items into it.
    • Improved usability of the Web Console.
    • Improved the discoverability of Firefox Sync.
    • Reduced browser startup time when using Panorama.
    • Fixed several stability and security issues.
    6.0.1 August 30, 2011 Off-cycle security update.
    • Revoked the root certificate for DigiNotar due to fraudulent SSL certificate issuance.[33]
    6.0.2 September 6, 2011 Off-cycle security update.[34]
    • Removed trust exceptions for certificates issued by Staat der Nederlanden
    • Resolved an issue with gov.uk websites.
    • Last release for Android 2.0

    End-of-life 6.0.x product lineon September 27, 2011.

    7.0 September 27, 2011 Official Firefox 7.0 release.[14]
    • Drastically improved memory handling for certain use cases.
    • Added a new rendering backend to speed up Canvas operations on Windows systems.
    • Bookmark and password changes now sync almost instantly when using Firefox Sync.
    • The URL prefix is now hidden by default.
    • Added support for text-overflow: ellipsis.
    • Added support for the Web Timing specification.
    • Enhanced support for MathML.
    • The WebSocket protocol has been updated from version 7 to version 8.
    • Added an opt-in system for users to send performance data back to Mozilla to improve future versions of Firefox.
    • Fixed several security and stability issues.
    7.0.1 September 29, 2011 Off-cycle security and stability update.[18]
    • Fixed a rare issue where some users could find one or more of their add-ons hidden after a Firefox update.
    • Last release for Maemo.

    End-of-life 7.0.x product lineon November 8, 2011.

    8.0 November 8, 2011 Official Firefox 8.0 release.[20]
    • Add-ons installed by third-party programs are now disabled by default.
    • Added a one-time add-on selection dialog to manage previously installed add-ons.
    • Added Twitter to the search bar.
    • Added a preference to load tabs on demand, improving startup time when windows are restored.
    • Improved performance and memory handling when using <audio> and <video> elements.
    • Added Cross-Origin Resource Sharing (CORS) support for cross-domain textures in WebGL.
    • Added support for HTML5 context menus.
    • Added support for .
    • Improved CSS hyphen support for many languages.
    • Improved WebSocket support.

    Changes during betas

    • Removed support for new tab animation due to incompatibilities with some extensions.
    8.0.1 November 21, 2011 Off-cycle security and stability update.[35]
    • Fixed Mac OS X crash that occurred in certain instances when a Java Applet is loaded with Java SE 6 version 1.6.0_29 installed.
    • Fixed Windows startup crash caused by RoboForm versions older than 7.6.2.

    End-of-life 8.0.x product lineon December 20, 2011.

    9.0 December 20, 2011 Official Firefox 9.0 release.[22]
    • Added type inference, significantly improving JavaScript performance.
    • Improved theme integration for Mac OS X Lion.
    • Added two finger swipe navigation for Mac OS X Lion.
    • Added support for querying Do Not Track status via JavaScript.
    • Added support for the CSS property.
    • Improved support for the CSS property.
    • Improved standards support for HTML5, MathML, and CSS.
    9.0.1 December 21, 2011 Off-cycle security and stability update.[36]
    • Fixed crash on Windows, Mac and Linux.

    End-of-life 9.0.x product lineon January 31, 2012.

    Firefox 10 through 16

    Firefox 10 and Firefox ESR 10 were released on January 31, 2012.[37][38] Firefox 10 added a full screen API and improved WebGL performance, support for CSS 3D Transforms and for anti-aliasing in the WebGL standard for hardware-accelerated 3D graphics. These WebGL updates mean that more complex site and Web app animations can render smoothly in Firefox, and that developers can animate 2D objects into 3D without plug-ins.[39][40] It also introduced a new CSS Style Inspector, which allow users to check out a site's structure and edit the CSS without leaving the browser.[37] Firefox 10 assumed all add-ons made for at least Firefox 4 were compatible. The add-on developer is able to alert Mozilla that the add-on is incompatible, overriding compatibility with version 10 or later. This new rule also does not apply to themes.[41]

    Firefox 10 ESR is the first Extended Support Release (ESR) as previously on January 10, 2012, where the Mozilla Foundation announced the availability of an ESR version of Firefox.[42] Firefox ESR is intended for groups who deploy and maintain the desktop environment in large organizations such as universities and other schools, county or city governments and businesses. During the extended cycle, no new features will be added to a Firefox ESR; only high-risk/high-impact security vulnerabilities or major stability issues will be corrected.[43]

    3D page inspector, a feature of versions 11 to 46.[44]

    Firefox 11 was released on March 13, 2012. Firefox 11 introduced many new features, including migration of bookmarks and history from Google Chrome,[45]SPDY integrated services, Page Inspector Tilt (3D View), Add-onSync, redesigned HTML5 video controls, and the Style Editor (CSS).[46] The update also fixed many bugs, and improved developer tools.[47]

    Firefox 12 was released on April 24, 2012. Firefox 12 introduced few new features, but it made many changes and laid the ground work for future releases. Firefox 12 for Windows added the Mozilla Maintenance Service which can update Firefox to a newer version without a UAC prompt.[48] It also added line numbers in the "Page Source" and centered find in page results. There were 89 improvements to Web Console, Scratchpad, Style Editor, Page Inspector, Style Inspector, HTML view and Page Inspector 3D view (Tilt).[49] Many bugs were fixed, as well as many other minor under-the-hood changes.[50][51] Firefox 12 is the final release to support Windows 2000 and Windows XP RTM & SP1.[52][53]

    Firefox 13 was released on June 5, 2012.[54] Starting with this version, Windows support was exclusively for Windows XP SP2/SP3, Windows Vista, and Windows 7. Firefox 13 adds and updates several features, such as an updated new tab[55] and home tab page.[56] The updated new tab page is a feature similar to the Speed Dial already present in Opera, Google Chrome, Apple Safari, and Internet Explorer. The new tab page will display nine of the user's most visited websites, along with a cached image. In addition to the updated new tab and home tab page, Mozilla has added a user profile cleaner/reset, reduced hang times, and implemented tabs on demand.[57] The user profile cleaner/reset provides a way for users to fix Firefox errors and glitches that may occur.[58] Mozilla's tabs on demand restores tabs that were open in the previous session, but will keep the tabs unloaded until the user requests to view the page.[59]

    Firefox 14 was released on June 26, 2012 for mobile devices only, just outside the regular release schedule of the web browser.[60] In order to sync the version numbers of the desktop and mobile versions of Firefox, Mozilla decided to release version 14.0.1 for both mobile and desktop on July 17, 2012, instead of Firefox 14 version 14.0 for the desktop and version 14.0.1 for mobile devices.[60]

    Firefox 14 introduces a new hang detector (similar to how Mozilla currently collects other data) that allows Mozilla to collect, analyze, and identify the cause of the browser freezing/hanging. Mozilla uses this information to improve the responsiveness of Firefox for future releases.[61] In addition to tackling freezing and not-responding errors that occur because of Firefox, Mozilla implemented opt-in activation for plugins such as Flash and Java. Mozilla wants to reduce potential problems that could arise through the unwanted use of third-party applications (malware, freezing, etc.).[62]

    Firefox 15 was released on August 28, 2012 with a "Responsive Design View" developer tool,[63] adds support for the Opus audio format, and adds preliminary native PDF support (disabled by default).[64]

    Firefox 15 introduced silent updates, an automatic update that will update Firefox to the latest version without notifying the user,[65] a feature that the web browsers Google Chrome and Internet Explorer 8 and above have already implemented,[66][67] although the user was able to disable that function.[68] The startup time in Firefox 15 was improved for Windows users.[69]

    Firefox 16 was released on October 9, 2012, fixing outstanding bugs of the new features in Mac OS X Lion. There were improvements made to startup speed when a user wants to restore a previous session.[70] Support for viewing PDF files inline was added in placement of a plugin. Support for web apps was added. Opus audio format is now enabled by default.[71]

    The roll-out of Firefox 16 revision 16.0.0 was stopped on October 10, 2012, after Mozilla detected a security flaw and recommended downgrading to 15.0.1 until the issue could be fixed.[72] The security flaw was fixed in version 16.0.1, which was released the following day, October 11, 2012.[73]

    Release history of Firefox 10–16
    Version Release date[23]Release type and highlights[t 1]
    10.0 January 31, 2012 Official Firefox 10.0 release.[37]
    • Most add-ons are now compatible with new versions of Firefox by default.
    • Anti-Aliasing for WebGL is now implemented.
    • CSS3 3D-Transforms are now supported.
    • New element for bi-directional text isolation, along with supporting CSS properties.
    • Full Screen APIs allow you to build a web application that runs full screen.
    10.0.1 February 10, 2012 Off-cycle security and stability update.[74]
    10.0esr January 31, 2012 Official Firefox 17.0 Extended Support Release (ESR).

    First Extended Support Release (ESR).[38]

    Same changelogs of 10.0

    10.0.1esr February 10, 2012 Off-cycle security and stability update.

    Same changelogs of 10.0.1

    10.0.2 February 16, 2012 Off-cycle security and stability update.[75]
    • Fixed Java applets that sometimes caused text input to become unresponsive.

    End-of-life 10.0.x product lineon March 13, 2012.

    10.0.2esr February 16, 2012 Off-cycle security and stability update.

    Same changelogs of 10.0.2

    10.0.3esr March 13, 2012 Regular security and stability update.[76]
    • Security fixes[77]
    • Fixed web workers running out of memory, affecting some add-ons used by organizations.
    10.0.4esr April 24, 2012 Regular security and stability update.[78]
    • Fixed an issue in Firefox ESR 10.0.3 that caused the "Whats New" page to open after an update.
    • Fixed extensions.checkCompatibility.* prefs not working in ESR releases.
    10.0.5esr June 5, 2012 Regular security and stability update.[79]
    • Fixed the 10.0.5 Firefox top crash with signature [@ GLEngine@0x620cf ].
    10.0.6esr July 17, 2012 Regular security and stability update.[80]
    • Fixed some text editing inconsistencies.
    10.0.7esr August 28, 2012 Regular security and stability update.[81]
    • Fixed contenteditable breaks in 10.0.7 that middle-click to open links.
    • Addressed a fix that allows specifying wildcard that matches all simple netbiosnames in network.automatic-ntlm-auth.trusted-uris.
    10.0.8esr October 9, 2012 Regular security and stability update.[82]
    10.0.9esr October 12, 2012 Off-cycle security update.[83]
    10.0.10esr October 26, 2012 Off-cycle security update.[84]
    10.0.11esr November 20, 2012 Off-cycle security update.[85]
    10.0.12esr January 8, 2013 Regular security update.[86]End-of-life 10.0.x ESR product lineon February 19, 2013.
    11.0 March 13, 2012 Official Firefox 11.0 release.[47]
    • Migration of settings from Google Chrome.
    • SPDY protocol support (disabled by default).
    • RFC 6455 WebSocket protocol support with an unprefixed API.
    • Page Inspector Tilt (3D View).
    • Sync Add-ons.
    • Redesigned HTML5 video controls.
    • Style Editor (CSS).

    End-of-life 11.0.x product lineon April 24, 2012.

    12.0 April 24, 2012 Official Firefox 12.0 release.[51]
    • Windows: Firefox is now easier to update with one less prompt (User Account Control).
    • Last release for Windows 2000.[87]
    • Reintroduced on-demand loading of pinned tabs after restoring a session.
    • Page Source now has line numbers.
    • Line breaks are now supported in the title attribute.
    • Improvements to "Find in Page" to center search result.
    • URLs pasted into the download manager window are now automatically downloaded.
    • Support for the text-align-last CSS property has been added.
    • Experimental support for ECMAScript 6 Map and Set objects has been implemented.
    • Some TinyMCE-based editors failed to load.
    • OS X: WebGL performance may be degraded on some hardware.

    End-of-life 12.0.x product lineon June 5, 2012.

    13.0 June 5, 2012 Official Firefox 13.0 release.[54]
    • When opening a new tab, users are now presented with their most visited pages.
    • The default home page now has quicker access to bookmarks, history, settings, and more.
    • SPDY protocol now enabled by default for faster browsing on supported sites.
    • Restored background tabs are not loaded by default for faster startup.
    • Smooth scrolling is now enabled by default.
    • 72 total improvements to Page Inspector, HTML panel, Style Inspector, Scratchpad and Style Editor.
    • The column-fill CSS property has been implemented.
    • Experimental support for ECMAScript 6 Map and Set objects has been implemented.
    • Support for the CSS3 background-position property extended syntax has been added.
    • The :invalid pseudo-class can now be applied to the element.
    • The CSS turn angle unit is now supported.
    13.0.1 June 15, 2012 Off-cycle security and stability update.[88]
    • Fixed an issue when Windows Messenger did not load in Hotmail, and the Hotmail inbox did not auto-update.
    • Fixed the Hebrew text that was sometimes rendered incorrectly.
    • Fixed an issue in Adobe Flash 11.3 that sometimes caused a crash on quit.

    End-of-life 13.0.x product lineon July 17, 2012.

    14.0 June 26, 2012 Android

    Official Firefox Mobile 14.0 release.[60]

    • Google searches now utilize HTTPS.
    • Full screen support for Mac OS X Lion implemented.
    • Plugins can now be configured to only load on click (about:config).
    • The Awesome Bar now auto-completes typed URLs, a new feature that will suggest a website that user frequently visits for a faster browsing.[89]
    • Improved site identity manager, to prevent spoofing of an SSL connection with favicons.
    • Pointer Lock API implemented.
    • New API to prevent your display from sleeping.
    • New text-transform and font-variant CSS improvements for Turkic languages and Greek.
    • Long URLs now extend the status bar almost to the whole width of the viewport.
    • Optional Gstreamer backend for HTML5 video to allow H.264 playback.[90] This allows playback of H.264 if the codec is installed as a GStreamer plugin. GStreamer support is not enabled in the official builds, but can be enabled at compile time.
    14.0.1 July 17, 2012 Desktop

    Official Firefox Desktop 14.0 release.[91]

    • Fixed the GIF animation that can get stuck when src and image size are changed.
    • Mac OS X: Fixed the nsCocoaWindow::ConstrainPosition that uses wrong screen in multi-display setup.
    • Fixed the CSS :hover regression when an element's class name is set by JavaScript.

    End-of-life 14.0.x product lineon August 28, 2012.

    15.0 August 28, 2012 Official Firefox 15.0 release.[64]
    • Silent update: Background updates.
    • Support for SPDY networking protocol v3.
    • WebGL enhancements, including compressed textures for better performance.
    • Localization in Maithili.
    • Optimized memory usage for add-ons.
    • JavaScript debugger integrated into developer tools.
    • New layout view added to Inspector.
    • High precision event timer implemented.
    • The CSS word-break property has been implemented.
    • New responsive design tool allows web developers to switch between desktop and mobile views of sites.
    • Native support for the Opus audio format added.
    • The <audio> and <video> elements now support the played attribute.
    • The source element now supports the media attribute.
    • Fixed the focus rings that keep growing when repeatedly tabbing through elements.
    15.0.1 September 6, 2012 Off-cycle stability update.[92]
    • Addressed a fix where sites visited while in Private Browsing mode could be found through manual browser cache inspection.

    End-of-life 15.0.x product lineon October 9, 2012.

    16.0 October 9, 2012 Official Firefox 16.0 release.[71]
    • Firefox on Mac OS X now has preliminary VoiceOver support turned on by default.
    • Initial web app support (Windows/Mac/Linux).
    • Acholi and Kazakh localizations added.
    • Improvements around JavaScript responsiveness through incremental garbage collection.
    • New Developer Toolbar with buttons for quick access to tools, error count for the Web Console, and a new command line for quick keyboard access.
    • CSS3 Animations, Transitions, Transforms and Gradients unprefixed.
    • Recently opened files list in Scratchpad implemented.
    • Fixed an issue where debugger breakpoints do not catch on page reload.
    • No longer supporting MD5 as a hash algorithm in digital signatures.
    • Opus support by default.
    • Reverse animation direction has been implemented.
    • Per tab reporting in about:memory.
    • User Agent strings for pre-release Firefox versions now show only major version.
    16.0.1 October 11, 2012 Off-cycle security and stability update.[73]
    16.0.2 October 26, 2012 Off-cycle security and stability update.[93]

    Final release to support Mac OS X Leopard[94]End-of-life 16.0.x product lineon November 20, 2012.

    Firefox 17 through 23

    Logo used from Firefox 23 to Firefox 56

    Logo used from Firefox 23 to Firefox 56

    Firefox 17 and Firefox ESR 17 were released on November 20, 2012.[95] It was not planned to bring as many user-facing features as previous releases, it brings improved display of location bar results,[96] improvements to the silent update mechanism for users with incompatible add-ons,[97] and refinements to the Click-To-Play system introduced in Firefox 14.[98] A new feature for developers, an HTML tree editor[99] is also included. Firefox 17 is the first version of the browser that uses SpiderMonkey 17.[100]

    Starting with Firefox 17, Mac OS X support is exclusively for Snow Leopard, Lion, and Mountain Lion.

    Firefox 18 was released on January 8, 2013.[101] A new feature for Firefox 18 is IonMonkey, Mozilla's next generation JavaScript engine,[102] it also uses some functions of WebRTC.[103]

    Firefox 19 was released on February 19, 2013, featuring a built-in PDF viewer.[104]

    Firefox 20 was released on April 2, 2013, introduced a panel-based download manager,[105][106] along with H.264 decoding on the tag (on Windows only), and per-window private browsing (per-tab private browsing on Android). It also includes a new developer toolbox, that combines all developer tools into one panel.

    Firefox 21 was released on May 14, 2013. The Social API now supports multiple providers, and an enhanced three-state UI for Do Not Track (DNT).[107]

    Firefox 22 was released on June 25, 2013. WebRTC is now enabled by default.[108] Partial CSS Flexbox support was added (flex-wrap support was scheduled for Firefox 28[109]). A new feature for Firefox 22 was OdinMonkey, Mozilla's next generation JavaScript engine.

    Firefox 23 was released on August 6, 2013. It includes an updated Firefox logo, mixed content blocking enabled by default to defend against man-in-the-middle attacks, implementation of the form control attribute in HTML5, dropping support for the HTML element as well as the CSS element, the restriction to have to "switch to a different search provider across the entire browser", and a global browser console, a new network monitor among other things. JavaScript is automatically enabled by the update, without regard to the previous setting, and the ability to turn it off has been removed from the interface;[110] the "contentious" change was made because many websites depend on JavaScript and it was felt that users unaware that they had disabled JavaScript were attributing the resulting unpredictable layout to software bugs in Firefox.[111]

    Release history of Firefox 17–23
    Version Release date[23]Release type and highlights[t 1]
    17.0 November 20, 2012 Official Firefox 17.0 release.[95]
    • First revision of the Social API and support for Facebook Messenger.
    • Click-to-play blocklisting implemented to prevent vulnerable plugin versions from running without the user's permission.
    • Updated Awesome Bar experience with larger icons.
    • Mac OS X 10.5 is no longer supported.
    • JavaScript Maps and Sets are now iterable.
    • SVG FillPaint and StrokePaint implemented.
    • Improvements that make the Web Console, Debugger and Developer Toolbar faster and easier to use.
    • New Markup panel in the Page Inspector allows easy editing of the DOM.
    • Sandbox attribute for iframes implemented, enabling increased security.
    • Over twenty performance improvements, including fixes around the New Tab page.
    • Fixed pointer lock that doesn't work in web apps.
    • Fixed page scrolling on sites with fixed headers.
    17.0esr November 20, 2012 Official Firefox 17.0 Extended Support Release (ESR).
    17.0.1 November 30, 2012 Off-cycle stability update.[112]
    • Reverted user agent change causing some website incompatibilities.
    • Fixed font rendering issue.

    End-of-life 17.0.x product lineon January 8, 2013.

    17.0.1esr November 30, 2012 Off-cycle stability update.
    17.0.2esr January 8, 2013 Regular security and stability updates.
    • Fixed improvements to the Click-to-Play vulnerable plugin blocklisting feature.[113]
    17.0.3esr February 19, 2013 Regular security update.[114]
    17.0.4esr March 7, 2013 Regular security update.[115]
    17.0.5esr April 2, 2013 Regular security update.[116]
    17.0.6esr May 10, 2013 Regular security update.[117]
    17.0.7esr June 25, 2013 Regular security update.[118]
    17.0.8esr August 6, 2013 Regular security update.[119]
    17.0.9esr September 17, 2013 Regular security update.[120]
    17.0.10esr October 29, 2013 Regular security update.[121]
    17.0.11esr November 15, 2013 Off-cycle stability update.[122]
    • Updated ESR17 to NSS 3.14.5 RTM.

    End-of-life 17.0.x ESR product lineon December 10, 2013.

    18.0 January 8, 2013 Official Firefox 18.0 release.[103]
    • Faster JavaScript performance via IonMonkey compiler.
    • Support for Retina displays on OS X 10.7 and up.
    • Preliminary support for WebRTC.
    • Better image quality with Mozilla's new HTML scaling algorithm.
    • Performance improvements around tab switching.
    • Support for new DOM property .
    • Improvement in startup time through smart handling of signed extension certificates.
    • Support for W3C touch events implemented, taking the place of MozTouch events.
    • Disable insecure content loading on HTTPS pages.
    • Improved responsiveness for users on proxies.

    Changes during Aurora releases

    • Adds a Metro user interface on Windows 8.
    18.0.1 January 18, 2013 Off-cycle stability update.[123]
    • Fixed problems involving HTTP Proxy Transactions.
    • Fixed unity player crashes on Mac OS X.
    • Disabled HIDPI support on external monitors to avoid rendering glitches.
    18.0.2 February 5, 2013 Off-cycle stability update.[124]End-of-life 18.0.x product lineon February 19, 2013.
    19.0 February 19, 2013 Official Firefox 19.0 release.[104]
    • Built-in PDF Viewer.
    • Canvas elements can export their content as an image blob using .
    • Startup performance improvements.
    • Debugger now supports pausing on exceptions and hiding non-enumerable properties.
    • Remote Web Console is available for connecting to Firefox on Android or Firefox OS (experimental, set devtools.debugger.remote-enabled to true).
    • There is now a Browser Debugger available for add-on and browser developers (experimental, set devtools.chrome.enabled to true).
    • Web Console CSS links now open in the Style Editor.
    • CSS @page is now supported.
    • CSS viewport-percentage length units implemented (vh, vw, vmin and vmax).
    • CSS text-transform now supports full-width.
    • Fixed certain valid WebGL drawing operations that were incorrectly rejected, leaving incomplete rendering in affected pages.
    • Fixed an issue that starting Firefox with -private flag incorrectly claims you are not in Private Browsing mode.
    • Fixed plugins that stop rendering when the top half of the plugin is scrolled off the top of the page, in HiDPI mode.
    19.0.1 February 27, 2013 Off-cycle stability update.[125]
    • Windows 8 only: Fixed stability issue for some AMD Radeon HD graphics cards.
    19.0.2 March 7, 2013 Off-cycle security update.[126]
    • Released to address a security vulnerability in the HTML editor.
    • Last release for Android 2.1

    End-of-life 19.0.x product lineon April 2, 2013.

    20.0 April 2, 2013 Official Firefox 20.0 release.[106]
    • Per-window Private Browsing.
    • New download experience.
    • Ability to close hanging plugins, without the browser hanging.
    • Continued performance improvements around common browser tasks (page loads, downloads, shutdown, etc.).
    • Continued implementation of draft ECMAScript 6 – and .
    • New JavaScript Profiler tool.
    • getUserMedia implemented for web access to the user's camera and microphone (with user permission).
    • now supports blend modes.
    • Various and improvements.
    • Fixed: Details button on Crash Reporter.
    • Fixed: Unity plugin that doesn't display in HiDPI mode.
    20.0.1 April 11, 2013 Off-cycle security update.[127]
    • Windows-only update to handle issues around handling UNC paths.

    End-of-life 20.0.x product lineon May 14, 2013.

    21.0 May 14, 2013 Official Firefox 21.0 release.[107]
    • The Social API now supports multiple providers.
    • Enhanced three-state UI for Do Not Track (DNT).
    • Preliminary implementation of Firefox Health Report.
    • Firefox will suggest how to improve your application startup time if needed.
    • Ability to Restore removed thumbnails on New tab Page.
    • CSS -moz-user-select:none selection changed to improve compatibility with -webkit-user-select:none.
    • Graphics related performance improvements.
    • Removed E4X support from SpiderMonkey.
    • Implemented Remote Profiling.
    • Integrated, Add-on SDK loader and API libraries into Firefox.
    • Added support for element.
    • Implemented scoped stylesheets.
    • Fixed: Some function keys may not work when pressed.
    • Fixed: Browsing and Download history clearing needs unification to avoid confusion on clearing download history.

    End-of-life 21.0.x product lineon June 25, 2013.

    22.0 June 25, 2013 Official Firefox 22.0 release.[108]
    • WebRTC is now enabled by default.
    • Windows: Firefox now follows display scaling options to render text larger on high-res displays.
    • Mac OS X: Download progress in Dock application icon.
    • HTML5 audio/video playback rate can now be changed.
    • Social services management implemented in Add-ons Manager.
    • asm.js optimizations (OdinMonkey) enabled for major performance improvements.
    • Improved WebGL rendering performance through asynchronous canvas updates.
    • Plain text files displayed within Firefox will now word-wrap.
    • For user security, the

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      Avast Free Antivirus

      Cloud-light, award-winning free virus protection

      Packed with the largest threat-detection network, machine-learning virus protection and home network security that won’t slow down your PC.

      What’s inside the latest version?

      A beautifully intuitive interface, advanced application protection, a new passive mode for running multiple security products in parallel — and a little something for you gamers and movie buffs.

      Designed for effortless security

      Just a click of our fresh, new, easy-to-use interface checks everything from your passwords to your home network security.


      Game or movie time.
      Now uninterrupted

      We’ve renamed Game Mode and taught it some new tricks. Now called Do Not Disturb Mode, it blocks distracting popups whether you’re gaming, watching movies, or presenting in fullscreen.

      Introducing Behavior Shield

      We don’t just check your applications for malware. We now keep an eye on their behavior to make sure they don’t suddenly go rogue.

      This is no run-of-the-mill free antivirus

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      Detect and block viruses, malware, spyware, ransomware and phishing. We use smart analytics to stop threats before they affect you.


      Automatically send suspicious files for analysis in the cloud, and push a cure to all Avast users if it's a threat.

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      Automatically detect weaknesses in your home Wi-Fi and strangers piggybacking on your network.

      Smart Scan

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      Avast Free Antivirus combines cutting-edge, AI-driven cybersecurity with a massive threat-detection network of over 435 million users that lets us protect our entire community in real time against online threats whenever they appear.

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      Now known as Microsoft Defender, Windows Defender isn’t enough to match leading third-party PC antivirus programs. While it’ll keep your computer relatively safe against most types of malware, its anti-phishing protection is limited to Microsoft Edge — you’ll need Avast Free Antivirus to protect you on other browsers like Chrome and Firefox. Microsoft Defender also doesn’t score quite as high with independent testing labs like AV-Comparatives. For comprehensive threat protection on your PC, go with Avast — Over 435 million users worldwide trust Avast.

      Visit our Support Center for more FAQs

      System requirements

      We’re not demanding. All you need is a PC with Windows 10, 8.1, 8 or 7*, 1 GB RAM and 2 GB of hard disk space. And that’s it.

      * Both the 32- and 64-bit versions, excluding Starter and RT editions.

      compatibility iconWindows 10 compatible
      Avast Free Antivirus

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      The Essential Guide to Computer Viruses

      A computer virus is a type of malware that can spread quickly between computers and other devices. Learn how viruses work and how to protect against them.

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      Want to learn about malware? Read this ultimate guide to find out what malware is, how it works, how it spreads and what you should do to protect yourself.

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      Have you noticed your Windows PC behaving strangely? Find out how to detect and remove viruses and other malware in this complete guide.

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      While iOS viruses don't yet exist, iPhones & iPads still face a variety of threats. Learn how to remove malware from iOS devices and avoid future attacks.

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      Doxing, or doxxing, is the release of someone's personal info without their consent. Find out how doxing works and how you can prevent it.

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      Источник: https://www.avast.com/free-antivirus-download

      Midnight Lizard color schemes work across all websites. The extension offers many predefined color schemes to choose from, or you’re free to explore and install more at midnight-lizard.org
       ✔ Choose between dark, light, grayscale or colorful color schemes
       ✔ Modify existing or create new color schemes
       ✔ Use different color schemes on each website
       ✔ Adjust brightness, saturation, contrast and hues
       ✔ Improve accessibility and readability
       ✔ Increase contrast to make text easier to read
       ✔ Apply blue light filter to shift all colors towards red light
       ✔ Keep original images and hues without inversion
       ✔ Schedule automatic activation and deactivation
       ✔ Use keyboard shortcuts to toggle extension
        ⮚ on current website: Alt+Shift+L
        ⮚ globally: Alt+Shift+M
       ✔ Use with local HTML files
       ✔ Shade bright colors and images
       ✔ Change any colour you want
       ✔ Dynamically change browser theme (disabled by default)
       ✔ Sync your settings
       ✔ Configure background, text, buttons, links, borders and images
       ✔ Apply globally, per-website or with url match patterns
       ✔ Switch between websites blacklist and whitelist modes
       ✔ Use Simplified mode to improve performance on heavy websites
       ✔ Contribute to our open source project on GitHub.com/Midnight-Lizard
       ✔ Donate to our OpenCollective.com/Midnight-Lizard

      Please use additional extensions in order to replace default New Tab page - extensions cannot style it. Also extensions don't work on New Tab page, Firefox Add-ons store and all Firefox system pages due to security concerns.

      Please take a look at this tutorial: HOW TO improve Midnight Lizard performance

      If you think this add-on violates Mozilla's add-on policies or has security or privacy issues, please report these issues to Mozilla using this form.

      Please don't use this form to report bugs or request add-on features; this report will be sent to Mozilla and not to the add-on developer.

      This add-on needs to:

      • Access your data for all websites

      ⏰ System theme schedule sync
      ⚙️ Settings popup fixes
      💾 Settings storage optimization
      📰 Firefox sidebar and new tab page styling
      📚 Firefox history navigation fix
      📜 Debug mode fix
      🔎 Google Search styles fix
      📑 Google Docs styles fix
      🌐 Dutch localization fix
      🌐 Google Translate styles fix

      Источник: https://addons.mozilla.org/en-US/firefox/addon/midnight-lizard-quantum/

      Resolve connection errors

      Find out how to fix Adobe connection errors when signing in or activating Adobe applications.

      If you experience connectivity issues or the following errors when signing into or activating Adobe applications, try the steps given in this article:

      • We are unable to activate [product name]. Product activation is required to use this product...
      • Please connect to the Internet and retry.
      • Either your computer is offline or the clock on your computer is set incorrectly, causing a connection error. An Internet connection is required. Please connect to the Internet or adjust your clock and try again.
      • You may have limited access to Adobe apps or services.

      If you're looking for more general information about common activation and sign-in issues, see Troubleshoot Creative Cloud activation errors or Activation and deactivation troubleshooting.

      To resolve issues related to connectivity, work out the solutions one by one and pick the next solution if required. 

      Solution 1: Test your connection to Adobe activation servers.

      1. To determine if you have access to the Adobe activation servers, click this link.

        If you see two Adobe logos, you have access to the activation servers. Try activating your software. If you need help with activating your account, see Activation and deactivation troubleshooting.

        Adobe logo

        Still have problems? Go to the next step.

      2. Start a web browser and open one of the following links, depending on the version of your product:

        If you see a test successful message (see screenshots below), you have access to the activation servers. Try activating or starting your software.

        Test successful message
        Test successful message


        You may get an "Access Denied" message when you click the CS5/CS5.5 link. This is still a confirmation that you can access the activation servers. Try activating or starting your software. If you need help with your activation code, see Redemption code help.

        Still have problems? Proceed to "Reset your hosts file."

      Solution 2: Reset your hosts file.

      Operating system hosts files map host names to IP addresses. An incorrectly configured hosts file can affect your computer's ability to connect to Adobe's activation servers.


      Creative Cloud users: Resetting the hosts file can also resolve errors such as "The Creative Cloud applications are available in trial mode" or "Trial expiration."

      1. Download the Limited Access Repair tool:

      2. Extract the downloaded file, and then run the Limited Access Repair tool in Admin mode.

        • Windows: Right-click the tool and choose Run as Administrator.
        • macOS: Double-click the tool and enter the admin credentials to continue.

        For more information on how to use the Limited Access tool, see Limited access error in Creative Cloud for desktop app.

        Note: If the issue is not fixed even after you run the Limited Access Repair tool, reset the hosts file manually.

      Reset the hosts file manually

      If the issue is not fixed even after you run the Limited Access Repair tool, reset the hosts file manually:

      To reset the hosts file on Windows, do the following:

      1. Navigate to C:\WINDOWS\System32\drivers\etc.

      2. Open the hosts file with a text editor such as Notepad.

      3. Check for any Adobe-related entries in the hosts file.

        Adobe entries in hosts file

        If there are no Adobe-related entries in the hosts file, no further troubleshooting is required. 

        However, if there are Adobe-related entries in the hosts file, proceed to the next step.

      4. If there are Adobe-related entries in the hosts file, move the file to the desktop, for example by dragging.

      5. Delete the Adobe-related entries from the hosts file.

        Make sure that you do not delete any other entries.

      6. Save the hosts file that you edited in the previous step.

        The updated hosts file should not have any Adobe-related entries.

      7. Move the file from desktop to the original location: 


        When moving the file, select the Replace option.

        Sample Hosts File

      To reset the hosts file on macOS, do the following:

      1. To find the hosts file, open Finder and then choose Go > Go to Folder. In the box, type the following location and then press Return:


        Find Hosts File MacOS

        If you are unable to locate the file, it means that the hosts file is hidden. Type the following command in terminal to unhide the file, and then repeat Step 1.

        chflags nohidden /etc/hosts

      2. Open the hosts file using a text editor such as Text Edit.

      3. Check for any Adobe-related entries in the hosts file.

        Hosts File for MacOS

        If there are no Adobe-related entries in the hosts file, no further troubleshooting is required. 

        However, if there are Adobe-related entries in the hosts file, proceed to the next step.

      4. If there are Adobe-related entries in the hosts file, move the file to the desktop, for example by dragging.

      5. Delete the Adobe-related entries from the hosts file.

        Make sure that you do not delete any other entries.

      6. Save the hosts file that you edited in the previous step.

      7. Move the file from desktop to the original location: 


        When moving the file, select the Replace option.

        The updates hosts file should not have any Adobe-related entries.

        Hosts Database MacOS

      Solution 3: Make sure that you can access secure sites.

      Adobe’s activation servers are on secure (HTTPS) sites, so your computer must be able to access these types of sites.

      Secure HTTPS sites

      Follow these steps to make sure that you can access secure sites:

      1. Start an Internet browser, such as Firefox or Internet Explorer.

      2. Type https://www.adobe.com in the address bar, and then press Enter.

      Can't access secure sites?

      Make sure that your computer's clock shows the correct time and is set to the correct time zone.

      If your computer is behind an authorization proxy server, disable it. For instructions, consult your network administrator or your proxy server documentation.

      If your computer is behind a firewall, make sure that the firewall is not blocking the activation server through ports 80 and 443.

      For instructions on allowing access to the activation server, consult your network administrator or your home network’s firewall documentation.


      If your firewall requires an executable, specify PDApp.exe, located here:

      • Windows: Program Files\Common Files\Adobe\OOBE\PDApp\core
      • macOS: Applications > Utilities > Adobe Application Manager > core > PDApp

      Solution 4: Check the GlobalSign Root CA certificate.

      The Adobe sign-in (Creative Cloud) and activation (Creative Suite) processes require the GlobalSign Root CA certificate.

      Follow these steps to make sure that the GlobalSign Root CA certificate is installed and enabled.

      1. Click Start and type certmgr.msc.

      2. Navigate to Current User >Trusted Root Certificate Authorities > Certificates.

      3. Right-click GlobalSign Root CA and select Properties.

        Properties Option in GlobalSign Root CA
      4. Verify that the certificate is enabled for server authentication.

        GlobalSign Root CA Properties
      1. Go to Applications/Utililies/Keychain Access.

      2. Locate the GlobalSign Root CA certificate. You may need to select the All Items category, and then search for Global to locate the certificate.

        GlobalSign Root CA certificate in Mac OS


        If the certificate is not available, see Alert "The certificate issuer for this site is untrusted" for steps to install the certificate.

      3. Right-click the certificate and choose Get Info.

      4. Verify that the certificate is enabled.

        Certificate properties (macOS)
      Источник: https://helpx.adobe.com/x-productkb/policy-pricing/activation-network-issues.html
      firefox full download  - Activators Patch

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