Firefox download current version

Firefox download current version

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firefox download current version

Firefox Releases. Firefox release notes are specific to each version of the application. Select your version from the list below to see the release notes for it. Download Mozilla Firefox for Windows now from Softonic: 100% safe and virus free. More than 124698 downloads this month. Download Mozilla Firefox latest. Right now you can download the newest version from our website, and will be operating from a new wholly owned subsidiary of the Mozilla Foundation, MZLA.

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Firefox version history

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 83 is the latest version, which was released on November 17, 2020.

Current and future releases

Current supported official releases

Current supported test releases

Future official releases

Rapid
ESR

Early versions

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]

Firefox 11 was released on March 13, 2012. Firefox 11 introduced many new features, including migration of bookmarks and history from Google Chrome,[44]SPDY integrated services, Page Inspector Tilt (3D View), Add-onSync, redesigned HTML5 video controls, and the Style Editor (CSS).[45] The update also fixed many bugs, and improved developer tools.[46]

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.[47] 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).[48] Many bugs were fixed, as well as many other minor under-the-hood changes.[49][50] Firefox 12 is the final release to support Windows 2000 and Windows XP RTM & SP1.[51][52]

Firefox 13 was released on June 5, 2012.[53] 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[54] and home tab page.[55] 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.[56] The user profile cleaner/reset provides a way for users to fix Firefox errors and glitches that may occur.[57] 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.[58]

Firefox 14 was released on June 26, 2012 for mobile devices only, just outside the regular release schedule of the web browser.[59] 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.[59]

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.[60] 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.).[61]

Firefox 15 was released on August 28, 2012 with a "Responsive Design View" developer tool,[62] adds support for the Opus audio format, and adds preliminary native PDF support (disabled by default).[63]

Firefox 15 introduced silent updates, an automatic update that will update Firefox to the latest version without notifying the user,[64] a feature that the web browsers Google Chrome and Internet Explorer 8 and above have already implemented,[65][66] although the user was able to disable that function.[67] The startup time in Firefox 15 was improved for Windows users.[68]

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.[69] 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.[70]

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.[71] The security flaw was fixed in version 16.0.1, which was released the following day, October 11, 2012.[72]

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.[73]
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.[74]
  • 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.[75]
  • Security fixes[76]
  • 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.[77]
  • 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.[78]
  • Fixed the 10.0.5 Firefox top crash with signature [@ GLEngine@0x620cf ].
10.0.6esr July 17, 2012 Regular security and stability update.[79]
  • Fixed some text editing inconsistencies.
10.0.7esr August 28, 2012 Regular security and stability update.[80]
  • 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.[81]
10.0.9esr October 12, 2012 Off-cycle security update.[82]
10.0.10esr October 26, 2012 Off-cycle security update.[83]
10.0.11esr November 20, 2012 Off-cycle security update.[84]
10.0.12esr January 8, 2013 Regular security update.[85]End-of-life 10.0.x ESR product lineon February 19, 2013.
11.0 March 13, 2012 Official Firefox 11.0 release.[46]
  • Migration of settings from Google Chrome.
  • SPDY protocol support (disabled by default).
  • RFC 6455WebSocket 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.[50]
  • Windows: Firefox is now easier to update with one less prompt (User Account Control).
  • Last release for Windows 2000.[86]
  • 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.[53]
  • 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.[87]
  • 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.[88]

  • 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.[63]
  • 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.[70]
  • 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.[72]
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

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 |Components| 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. Also, it brings many bug fixes, security improvements, and developer-related changes.[137]

Firefox 28 was released on March 18, 2014. It added support for VP9 video decoding and support for Opus in WebM.[138] For Android, features such as predictive lookup from the address bar, quick share buttons and support for OpenSearch were added.[139]

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.[140]

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.[141][142]

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.[143]
24.1.1esr November 15, 2013 Off-cycle stability update.[144]
  • 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.[145]
24.3.0esr February 4, 2014 Regular security update.[146]
24.4.0esr March 18, 2014 Regular security update.[147]
24.5.0esr April 29, 2014 Regular security update.[148]
24.6.0esr June 10, 2014 Regular security update.[149]
24.7.0esr July 22, 2014 Regular security update.[150]
24.8.0esr September 2, 2014 Regular security update.[151]
24.8.1esr September 24, 2014 Off-cycle security update.[152]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.[153]
  • 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.[154]
  • 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.[137]
  • 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.[155]
  • Fixed stability issues with Greasemonkey and other JavaScript that used ClearTimeoutOrInterval.
Источник: https://en.wikipedia.org/wiki/Firefox_version_history
firefox download current version

Firefox download current version

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