|Origins and lineage|
"Firefox 1.0 was released on November 9, 2004, Firefox 1.5 was released on November 29, 2005, and "version 2.0 was released on October 24, 2006. "Firefox 3.0 was released on June 17, 2008, with "version 3.5 and "version 3.6 released on June 30, 2009 and January 21, 2010, respectively. "Version 4.0 was released on March 22, 2011. Since the version 5.0, a rapid release cycle was put into effect, resulting in a new major version release every six weeks on Tuesday.
The latest version, Firefox 58.0, was released on January 23, 2018.
The project that became Firefox began as an experimental branch of the Mozilla Suite called m/b (or mozilla/browser). After it was sufficiently developed, binaries for public testing appeared in September 2002 under the name Phoenix. This name carried the implication of the "mythical firebird that rose triumphantly from the ashes of its dead predecessor, in this case "Netscape Navigator which lost the ""First browser war" to "Microsoft's "Internet Explorer. The name Mozilla began as the internal "codename for the original 1994 Netscape Navigator browser aiming to displace "NCSA Mosaic as the world's most popular "web browser. The name for this would-be "Mosaic killer" was meant to evoke the building-crushing "Godzilla. The name Mozilla was revived as the 1998 open sourcing spinoff organization from Netscape.
The name Phoenix remained until April 14, 2003, when it was changed because of a trademark dispute with the "BIOS manufacturer, "Phoenix Technologies (which produces a BIOS-based browser called Phoenix FirstWare Connect). The new name, Firebird, met with mixed reactions, particularly as the "Firebird database server already carried the name. In response, the Mozilla Foundation stated that the browser should always bear the name Mozilla Firebird to avoid confusion with the database software.
Due to continuing pressure from the Firebird community, on February 9, 2004 the project was renamed again to Mozilla Firefox. The name "Firefox" (a reference to the "red panda) was chosen for its similarity to "Firebird", and its uniqueness in the computing industry. To ensure that no further name changes would be necessary, the Mozilla Foundation began the process of registering Firefox as a trademark with the "United States Patent and Trademark Office in December 2003. This trademark process led to a delay of several months in the release of Firefox 0.8 when the foundation discovered that Firefox had already been registered as a trademark in the UK for Charlton Company software. The situation was resolved when the foundation was given a license to use Charlton's European trademark.
Hyatt, Ross, Hewitt and Chanial developed their browser to combat the perceived "software bloat of the "Mozilla Suite (codenamed, internally referred to, and continued by the community as "SeaMonkey), which integrated features such as "IRC, mail and news, and "WYSIWYG "HTML editing into one "internet suite.
Firefox retains the "cross-platform nature of the original Mozilla browser, using the "XUL "user interface markup language. The use of XUL makes it possible to extend the browser's capabilities through the use of "extensions and "themes. The development and installation processes of these add-ons raised security concerns, and with the release of Firefox 0.9, the Mozilla Foundation opened a Mozilla Update website containing "approved" themes and extensions. The use of XUL sets Firefox apart from other browsers, including other projects based on Mozilla's "Gecko "layout engine and most other browsers, which use interfaces native to their respective platforms ("Galeon and "Epiphany use "GTK+; "K-Meleon uses "MFC; and "Camino uses "Cocoa). Many of these projects started before Firefox, and probably served as inspiration.
On February 5, 2004 "AMS, a business and IT consulting company, categorized Mozilla Firefox (then known as Firebird) as a "Tier 1" ("Best of Breed") open-source product, considering it technically strong and virtually risk-free.
Firefox 1.0 was released on November 9, 2004. The launch of version 1.0 was accompanied by "a respectable amount of pre-launch fervor" including a fan-organized campaign to run a full-page ad in "The New York Times.
Although the Mozilla Foundation had intended to make the Mozilla Suite obsolete and replace it with Firefox, the Foundation continued to maintain the suite until April 12, 2006 because it had many corporate users and was bundled with other software. The Mozilla community (as opposed to the Foundation) continues to release new versions of the suite, using the product name "SeaMonkey to avoid confusion with the original Mozilla Suite.
Firefox 1.5 was released on November 30, 2005. Originally, it was planned to have a version 1.1 at an earlier date as the new Firefox version after 1.0, with development on a later version (1.5) in a separate development branch, but during 2005 both branches and there feature sets were merged (the Mozilla Foundation abandoned the 1.1 release plan after the first two alpha builds), resulting in an official release date between the original dates planned for both versions.
Version 1.5 implemented a new Mac-like options interface, the subject of much criticism from "Microsoft Windows and "Linux users, with a "Sanitize" action to allow someone to clear their privacy-related information without manually clicking the "Clear All" button. In Firefox 1.5, a user could clear all privacy-related settings simply by exiting the browser or using a keyboard shortcut, depending on their settings. Moreover, the software update system was improved (with binary patches now possible). There were also improvements in the extension management system, with a number of new developer features. In addition, Firefox 1.5 had preliminary "SVG 1.1 support.
Behind the screens, the new version resynchronized the code base of the release builds (as opposed to nightly builds) with the core "trunk", which contained additional features not available in 1.0, as it "branched from the trunk around the 0.9 release. As such, there was a backlog of bug fixes between 0.9 and the release of 1.0, which were made available in 1.5.
There were also changes in operating system support. As announced on 23 June 2005 by the Mozilla Foundation, Firefox 1.1, which later became 1.5, and other new Mozilla products did no longer support "Mac OS X v10.1, in order to improve the quality of Firefox releases on "Mac OS X v10.2 and above. Firefox 220.127.116.11 was the final version supported on "Windows 95.
Alpha builds of Firefox 1.5 (id est, 1.1a1 and 1.1a2) did not carry Firefox branding; they were labelled "Deer Park" (which was Firefox 1.5's internal codename) and contained a different program icon. This was done to dissuade end-users from downloading preview versions, which are intended for developers only.
On October 24, 2006, Mozilla released "Firefox 2. This version includes updates to the "tabbed browsing environment; the extensions manager; the "GUI (Graphical User Interface); and the find, search and software update engines; a new session restore feature; inline spell checking; and an anti-"phishing feature which was implemented by "Google as an extension, and later merged into the program itself. In December 2007, Firefox Live Chat was launched. It allows users to ask volunteers questions through "a system powered by "Jive Software, with guaranteed hours of operation and the possibility of help after hours. Firefox 18.104.22.168 is the final version which can run under an unmodified installation of "Windows NT 4.0, "Windows 98, and "Windows ME.
Mozilla Firefox 2.0.0.x was the final version supported on Windows NT 4.0, 98 and Me. Mozilla Corporation announced it would not develop new versions of Firefox 2 after the 22.214.171.124 release, but continued Firefox 2 development as long as other programs, such as "Thunderbird mail client, depended on it. The final internal release was 126.96.36.199, released in late April 2009.
Firefox 3 was released on June 17, 2008, by the "Mozilla Corporation. Firefox 3 uses version 1.9 of the Mozilla "Gecko layout engine for displaying web pages. This version fixes many bugs, improves standard compliance, and implements new web "APIs. Other new features include a redesigned download manager, a new "Places" system for storing bookmarks and history, and separate "themes for different operating systems. Tabbed browsing was more popularised in this version. The final version under 3.0 is Firefox 3.0.19.
Development stretches back to the first Firefox 3 "beta (under the codename 'Gran Paradiso') which had been released several months earlier on November 19, 2007, and was followed by several more beta releases in spring 2008 culminating in the June release. Firefox 3 had more than 8 million unique downloads the day it was released, setting a "Guinness World Record.
<audio> tags as defined in the "HTML5 specification, with a goal to offer video playback without being encumbered by patent problems associated with many video technologies. Cross-site "XMLHttpRequests (XHR), which can allow for more powerful web applications and an easier way to implement "mashups, are also implemented in 3.5. A new global "JSON object contains native functions to efficiently and safely "serialize and deserialize JSON objects, as specified by the "ECMAScript 3.1 draft. Full CSS 3 selector support has been added. Firefox 3.5 uses the Gecko 1.9.1 engine, which includes a few features that were not included in the 3.0 release. "Multi-touch trackpad support was also added to the release, including "gesture support like pinching for zooming and swiping for back and forward. Firefox 3.5 also features an updated logo.
Version 3.6, released on January 21, 2010, uses the Gecko 1.9.2 engine and includes several interface improvements, such as "personas". This release was referred to as 3.2 before 3.1 was changed to 3.5. The codename for this version was Namoroka. This is the last major, official version to run on "PowerPC-based "Macintoshes.
One minor update to Firefox 3.6, version 3.6.4 (code-named "Lorentz) is the first minor update to make non-intrusive changes other than minor stability and security fixes. It adds Out of Process Plugins (OOPP), which runs plugins in a separate process, allowing Firefox to recover from plugin crashes.
Firefox 3.6.6 lengthens the amount of time a plug-in is allowed to be unresponsive before the plug-in quits.
Support for Firefox 3.6 ended on April 24, 2012.
The version number was changed to 4.0 (and Gecko's was changed to 2.0) starting with Beta 1, released on July 6, 2010.
Beta 2 was released on July 27, Beta 3 on August 11, Beta 4 on August 24, Beta 5 on September 7, Beta 6 (a chemspill release) on September 14.
After major delays, Beta 7 was finally released on November 10. Beta 7 was followed by Beta 8, released on December 21. Beta 9 was released on January 14, 2011, Beta 10 on January 25, Beta 11 on February 8, and Beta 12 on February 12.
Version 4 brought a new "user interface and is said to be faster. Early mockups of the new interface on "Windows, "Mac OS X, and "Linux were first made available in July 2009. Other new features included improved notifications, tab groups, application tabs, a redesigned add-on manager, integration with "Firefox Sync, and support for multitouch displays.
On October 13, 2006, "Brendan Eich, Mozilla's then "Chief Technology Officer, wrote about the plans for "Mozilla 2", referring to the most comprehensive iteration (since its creation) of the overall platform on which Firefox and other Mozilla products run. Most of the objectives were gradually incorporated into Firefox through versions 3.0, 3.5, and 3.6. The largest changes, however, were planned for Firefox 4.
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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. The "Beta" channel is another six weeks away. It 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.
New releases are planned to occur at six-week intervals. The stated aim of this faster-paced process is to get new features to users faster. This accelerated release cycle was met with criticism by users, as it often broke addon compatibility, as well as those who believe Firefox was simply trying to increase its version number to compare with other browsers such as "Google Chrome.
Firefox 5 was released on June 21, 2011, 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. Version 5 significantly improved the speed of web-related tasks, such as loading pages with "combo boxes or "MathML. Mozilla also integrated the "HTML5 video "WebM standard into the browser, allowing playback of WebM video.
Firefox 7, released September 27, 2011, uses as much as 50% less memory than Firefox 4 as a result of the MemShrink project to reduce Firefox memory usage. Mozilla 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. The ""http://" protocol indicator no longer appears in the URL.
Firefox 8 was released on November 8, 2011. Firefox 8 verified that users really wanted 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.
Firefox 10 and Firefox ESR 10 were released on January 31, 2012. It is the first official extended support release. Firefox 10 hides the forward arrow button until there is a website to go forward to, or it is manually activated. Firefox 10 adds a Full Screen API and improved WebGL performance.
Firefox 10 assumed all add-ons were compatible with version 10, as long as they are written for at least Firefox 4. 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.
Firefox 10 added the CSS Style Inspector to the Page Inspector, which allow users to check out a site's structure and edit the CSS without leaving the browser.
Firefox 10 added support for CSS 3D Transforms and for anti-aliasing in the WebGL standard for hardware-accelerated 3D graphics. These updates mean that complex site and Web app animations will render more smoothly in Firefox, and that developers can animate 2D objects into 3D without plug-ins.
Firefox 11 was released on March 13, 2012. Firefox 11 introduced many new features, including migration of bookmarks and history from "Google Chrome, "SPDY integrated services, Page Inspector Tilt (3D View), "Add-on "Sync, redesigned "HTML5 video controls, and the Style Editor ("CSS). The update also fixed many bugs, and improved developer tools.
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 "UAC prompt. 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). Many bugs were fixed, as well as many other minor under-the-hood changes. Firefox 12 is the final release to support "Windows 2000 and "Windows XP RTM & SP1.
Firefox 13 was released on June 5, 2012. Firefox 13 adds and updates several features, such as an updated new tab and home tab page. 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. The user profile cleaner/reset provides a way for users to fix Firefox errors and glitches that may occur. 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.
Starting with this version, Windows support was exclusively for Windows XP SP2/SP3, Windows Vista, & Windows 7.
Firefox 14.0 for Android was released on June 26, 2012, just outside the regular release schedule of the web browser. In order to sync the version numbers of the desktop and mobile version of Firefox, Mozilla decided to release Firefox 14.0.1 for mobile and desktop on July 17, 2012, instead of Firefox 14.0 for the desktop and Firefox 14.0.1 for mobile clients.
A new hang detector (similar to how Mozilla currently collects other data) allows Mozilla to collect, analyze, and identify the cause of the browser freezing/hanging. Mozilla will use this information to improve the responsiveness of Firefox for future releases.
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.).
URL complete will suggest the website that Firefox believes the user plans on visiting. It does this by inserting the remaining characters into the URL form box.
Firefox 14 has an optional "GStreamer back-end for HTML5 video tag playback. 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.
The first beta version of Firefox 14 was not beta 1, but beta 6 and was released on June 5, 2012.
Firefox 15 was released on August 28, 2012.
Silent updates automatically update Firefox to the latest version without notifying the user, a feature that the web browsers "Google Chrome and "Internet Explorer 8 and above have already implemented, although the user is able to disable that function.
Mozilla improved regular startup time for Windows users.
Firefox 16 was released on October 9, 2012.
Plans for this version called for fixing of bugs still outstanding involving support of new features in "Mac OS X Lion, improvements to startup speed when a user wants to restore a previous session, and support for viewing "PDF files inline without a plugin.
The roll-out of Firefox 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. The security flaw was fixed in version 16.0.1, which was released the following day, October 11, 2012. Version 16.0.2 was released October 26, 2012. It fixed additional security issues, and is also the final release to support "Mac OS X Leopard.
Firefox 17 was not planned to bring as many user-facing features as previous releases; it brings improved display of location bar results, improvements to the silent update mechanism for users with incompatible add-ons, and refinements to the Click-To-Play system introduced in Firefox 14. A new feature for developers, an HTML tree editor is also included. Firefox 17 is the first version of the browser that uses SpiderMonkey 17.
Firefox 18.0.1 was released on January 18, 2013, and fixed several bugs. Firefox 18.0.2 was released on February 5, 2013.
Firefox 19 was released on February 19, 2013. Firefox 19 features a built-in "PDF viewer. Firefox 19.0.1 was released on February 27, 2013 to fix stability issues for some AMD Radeon HD graphics cards in "Windows 8. Firefox 19.0.2 was released on March 7, 2013 to address a security vulnerability in the HTML editor.
Firefox 20 was released on April 2, 2013. A new feature of Firefox 20 is a panel-based download manager, along with H.264 decoding on the
<video> 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, enhanced three-state UI for Do Not Track (DNT).
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
<input type="range"> form control attribute in HTML5, dropping support for the "
<blink> HTML element as well as
The keyword.URL preference now is no longer supported, making it no longer possible to specify the search engine for the URL bar that way. The search engine selected for the search bar on the Navigation Toolbar is now automatically used also for the URL bar and about:home page.
Firefox 23.0.1 was released ten days later, August 16, 2013, to fix the rendering glitches on "H.264 video only in FF23 on "Windows Vista; it also fixed the "spell checking that was broken with non-"ASCII characters in profile path, and the audio static/"burble"/breakup in Firefox to Firefox "WebRTC calls.
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. Firefox 24 is the first version of the browser that uses SpiderMonkey 24.
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, did not make it to Firefox 28 Aurora channel, and was finally available with Firefox 29. This release added support for
<iframe srcdoc> attribute,
background-attachment:local in CSS, along with "Web audio API support, separate find bar for each tab and many other bug fixes.
Firefox 25.0.1 was released on November 15, 2013, to address issues with pages that sometimes wouldn't load without first moving the cursor.
Firefox 26 was released 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.
Firefox 26.0.1 was released only for Android on December 20, just ten days after the desktop release. It fixed screen distortion on some devices after tapping on search suggestion.
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.
Firefox 28 was released on March 18, 2014. It added support for VP9 video decoding and support for Opus in WebM. For "Android, features such as predictive lookup from the address bar, quick share buttons and support for "OpenSearch were added.
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.
Firefox 29.0.1 was released ten days later, fixing a few bugs.
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. 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 will be automatically updated to ESR version 31 after October 14, 2014.
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. Firefox 32.0.1 was released for mobile only on September 10, fixing the link tap selection that is offset on some Android devices; and for desktop two days later, fixing stability issues. Firefox 32.0.2 was released for desktop only on September 18, fixing the corrupt installations causing Firefox to crash on update. Firefox 32.0.3 was released for desktop and Android on September 24, fixing a security vulnerability.
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), "OpenH264 support, search suggestions on about:home and about:newtab, "address bar search improvements, "session restore reliability improvements, and other changes.
Firefox 33.0.1 was released for desktop only on October 24, 2014, fixing displaying of a black screen at startup with certain graphics drivers. Firefox 33.0.2 was released for desktop only on October 28, 2014, fixing a startup crash with some combination of hardware and drivers. Firefox 33.0.3 was released for desktop only on November 6, 2014, fixing several issues related to graphics drivers.
Firefox 34.0 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.
Firefox 35.0 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 includes security fixes.
Firefox 35.0.1 was released first for desktop on January 26, 2015, fixing various issues, and then for Android on February 5, 2015, fixing a 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.
Firefox 36.0 was released for desktop on February 24, 2015, bringing full "HTTP/2 support and other smaller improvements and fixes. It was also released for Android three days later, adding support for the tablet user interface.
Firefox 36.0.2 was released for Android only on March 16, 2015, fixing a startup crash on HTC One M8 devices (Verizon) with Android 5.0.1 and some potential crashes with Flash videos.
Firefox 36.0.3 was released on March 20, 2015; soon after that, Version 36.0.4 was released on March 21, 2015, for desktop and Android, fixing security issues disclosed at HP Zero Day Initiative's "Pwn2Own contest.
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.
Firefox 37.0.1 was released on April 3, 2015 for desktop and Android, fixing security issues and several crash issues. It also disabled opportunistic encryption of the HTTP traffic introduced in 37.0.
Firefox 37.0.2 was released for Android on April 14, 2015, fixing an issue related to the "request desktop site" feature, and for desktop on April 20, 2015, fixing a Google Maps rendering issue, stability issues for some graphics hardware and feature sets, and certain security issues.
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.
Firefox 38.0.1 and ESR 38.0.1 were released on May 14, 2015 for desktop, fixing a number of stability issues. Firefox 38.0.1 for Android was released on May 15, 2015, fixing a number of stability issues.
Firefox 38.0.5 was released on June 2, 2015 for desktop and Android, fixing bugs and security issues, and adding new functionality that included integration of "Pocket and availability of Reader View mode. This was the first release offered to the Release channel users since 38.0.1.
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. Firefox 39.0.3 was released on August 6, 2015, to fix a zero-day exploit.
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.
Firefox 40.0.2 was released for desktop only two days later on August 13, fixing some stability issues.
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.
Firefox 41.0.1 was released for desktop only on September 30, 2015, fixing some stability issues.
Firefox 41.0.2 was released on October 15, 2015, fixing a security vulnerability.
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.
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 users, a new strict blocklist, and audio indicators on Android.
Firefox 43.0.1 was released on December 18, 2015 for desktop only, to prepare for the use of SHA-256 signing certificate for Windows builds, to meet a new signing requirement. Three days later, Firefox 43.0.2 was released for desktop only, citing not only the use of SHA-256 signing certificate for Windows builds, but also various security fixes. Firefox 43.0.3 was released for desktop only on December 28, 2015, fixing a network issue when using Nvidia's Network Access Manager, and improving the decoding of some videos on "YouTube on some Windows configurations. Firefox 43.0.4 was released for desktop only on January 6, 2016, fixing a startup crash for users of a third party antivirus tool, allowing the creation of multi-user GNU/Linux download folders, and re-enabling SHA-1 certificates.
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. "Ask me every time" cookies option was removed without any notifications.
Firefox 44.0.1 was released on February 8, 2016 for desktop only, fixing an issue that could lead to the removal of stored passwords under certain circumstances; requiring NSS 3.21; and disabling opus/vorbis audio with H.264, among other things. Firefox 44.0.2 was released three days later for desktop and Android, fixing issues where Firefox hangs or crashes on startup among other issues.
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 Tab Groups (panorama) feature. Firefox 45.0.1 and Firefox 45.0.1 ESR were released on March 16, 2016 for desktop (both) and Android (no ESR). Several regressions are fixed and Graphite library is disabled. Firefox 45.0.2 and Firefox 45.0.2 ESR were released on April 11, 2016 for desktop (both) and Android (no ESR). Many fixes included are for the cookie header, compatibility regression (both), and a regression with the copy and paste with some old versions of some Gecko applications like Thunderbird (desktop only).
Firefox 46.0.1 was released on May 3, 2016 for both desktop and Android, fixing various issues, including add-on signing certificate expiration and page loading issue related to antivirus software.
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.
Firefox 47.0.1 was released on June 28, 2016 for desktop only, which fixed an issue with the Selenium WebDriver.
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 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 for part of the users.
It the last Firefox version to support "Mac OS X Snow Leopard, "Mac OS X Lion, and "OS X Mountain Lion.  Additionally, support for old processors without "SSE2 extensions such as the AMD Athlon XP and Pentium III was dropped.
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. Starting with this version, Mac OS X support is exclusively for "OS X Mavericks up to "macOS Sierra.
Firefox 49.0.1 was released three days later for desktop only, mitigating a Windows-only startup crash issue caused by Websense.
Firefox 49.0.2 was released for both desktop and Android on October 20, 2016; among the changes are asynchronous rendering of the Flash plugins that is now enabled by default (desktop), and the fix for web compatibility issue with file uploads (Android).
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 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).
Firefox 50.0.1 was released on November 28, 2016 for desktop only, fixing an issue where Firefox crashes with 3rd party Chinese IME when using IME text. Firefox 50.0.2 was released two days later for both desktop and Android, fixing a zero-day exploit in the wild among other exploits. Firefox 50.1.0 was released on December 13, 2016 for both desktop and Android, fixing more security bugs.
Firefox 51.0 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. Firefox 51.0.1 was released two days later for desktop only, fixing issues where multiprocess incompatibility did not correctly register with some add-ons, and geolocation was not working on Windows.
Firefox 51.0.2 was released on February 6, 2017 for Android only, fixing a crash caused by an Android library (Palette) on some x86 devices. Firefox 51.0.3 was released three days later for Android only, this time fixing a build issue which was causing some crashes on some x86 architectures, and including various security fixes.
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.
Among the many additions were: Added support for "WebAssembly, an emerging standard that brings near-native performance to Web-based games, apps, and software libraries without the use of plugins; automatic "captive portal detection, for easier access to Wi-Fi hotspots; user warnings for non-secure HTTP pages with logins (desktop); and display of media controls to pause or resume playback on the Android notification bar. This standard Firefox version is also the last version to support Windows XP and Vista.
Firefox 52.0.1 and 52.0.1 ESR were released on March 17, 2017 for desktop (both) and Android (no ESR), making various security fixes. Firefox 52.0.2 and 52.0.2 ESR were released on March 28, 2017 for desktop (both) and Android (no ESR), this time fixing loading tab icons on session restore; fixing a crash on startup on Linux (desktop); and disabling presentation API to avoid page loading delays.
Firefox 53 was released on April 19, 2017 for both desktop and Android. Among the many additions are: improved graphics stability for Windows users with the addition of compositor process separation; light and dark "compact" themes available, based on the Firefox Developer Edition theme; removal of support for 32-bit macOS and Linux support for processors older than "Pentium 4 and AMD Opteron; new visual design for audio and video controls; support for "WebM video with "alpha compositing, which allows playing videos with transparent backgrounds (desktop); Reader Mode displaying estimated reading time for the page (desktop and Android); and enabling two columns tabs setting in portrait mode (Android).
Starting with this version, Microsoft Windows support is exclusively for "Windows 7 and above.
Firefox 53.0.1 was released on April 27, 2017 for Android only, fixing some stability issues, including a rare condition that could prevent opening restored tabs. Firefox 53.0.2 was released on May 5, 2017 for both desktop and Android, fixing some security and stability issues, including making form validation errors and date picker panel visible to the user (desktop) and a fix for issues with Android integration. Firefox 53.0.3 was released on May 19, 2017 for desktop only, fixing some stability issues and bumping preloaded security information expiration times.
Firefox 54 was released on June 13, 2017 for both desktop and Android. Among the many additions are: simplifying the download button and download status "panel; added support for multiple content processes, and the ability to create and save custom devices in "Responsive web design mode (desktop); and improved audio and video playback in the browser, and improved bookmarks sync performance (Android).
Firefox 54.0.1 was released on June 29, 2017 for both desktop and Android, fixing many issues including those of a tab title, opening a new tab, opening multiple tabs, a PDF printing issue (desktop) and crashes in tab tray menu and issues with navigation (Android).
Firefox 55 was released on August 8, 2017 for both desktop and Android. Among the many additions are: the launch of Windows support for "WebVR, bringing immersive experiences to the web; options that let users optimize recent performance improvements; simplification of installation process with a streamlined Windows stub installer; improvement of address bar functionality; simplification of printing from Reader Mode (desktop); and the option to accessibility settings to respect the system's set font size when displaying web pages (Android). This is also the last version to support "Android Ice Cream Sandwich.
Firefox 55.0.1 was released on August 10, 2017 for desktop only, just two days after its initial launch, fixing some issues including a regression of the tab restoration process. Firefox 55.0.2 was released on August 16, 2017 for both desktop and Android, fixing some issues including a regression with the pop-up menu, an issue with new installation notification for sideload add-ons (desktop), and a crash with Telemetry (Android). Firefox 55.0.3 was released on August 25, 2017 for desktop only, fixing file uploads to some websites, including YouTube, and an issue with addons when using a path containing non-"ASCII characters.
Firefox 56 was released on September 28, 2017 for both desktop and Android. Among the many additions are: a new layout for the "Preferences" page, the launch of Firefox Screenshots, support for address form autofill, hardware acceleration for AES-GCM, update of the Safe Browsing protocol to version 4, and improved security or verifying update downloads (desktop); and improvement of support for WebExtensions, and the end of support for Adobe Flash (Android). Starting with this version, Android support is exclusively for "Android Jelly Bean and above.
Firefox 56.0.1 was released on October 9, 2017 for desktop only, blocking D3D11 when using Intel drivers on Windows 7 systems with partial AVX support, and migrating users of 32-bit Firefox on 64-bit Windows to 64-bit Firefox for increased stability and security.
Firefox 56.0.2 was released on October 26, 2017 for desktop only, disabling Form Autofill completely on user request, fixing video-related crashes on Windows 7 and a shutdown crash, and correcting detection for 64-bit GSSAPI authentication.
Firefox 57 was released on November 14, 2017 for desktop and Android with the name Firefox Quantum. Dubbed a "comeback" against the dominant "Google Chrome by "ZDNet after years of falling market share, the release included a new interface design, codenamed "Photon", and a new rendering engine almost twice as fast as the previous one used. Firefox 57 no longer supports legacy add-ons using "XUL technologies. That same day, Mozilla announced that Google would be the default search engine, a departure from Yahoo, which had been the default search engine since 2014.
Firefox 57.0.1 was released on November 29, 2017 for desktop and Android. Features include a fix for a video color distortion issue on YouTube and other video sites with some AMD devices; a fix for a Google Maps crash on macOS with Intel HD Graphics 3000; the block of an injection of a client library associated with the RealPlayer Free Player which is known to cause performance problems (desktop); and a fix for a stop button issue (Android).
Firefox 57.0.2 was released on December 7, 2017 for desktop only, blocking old versions of G Data Endpoint Security for crashing Firefox on start up and fixing a regression with WebGL and D3D9 (both Windows only).
Firefox 57.0.3 was released on December 28, 2017 for desktop only, fixing a crash reporting issue that inadvertently sends background tab crash reports to Mozilla without a user opt-in. Firefox 57.0.4 was released on January 4, 2018 for desktop and Android, with security fixes to address the "Meltdown and "Spectre timing attacks.
Firefox 58 was released on January 23, 2018 for desktop and Android. Among the additions were: support for credit card autofill, the drop of support for user profiles in previous versions of Firefox, a warning to alert users and site owners of planned security changes to sites affected by the gradual distrust plan for the Symantec certificate authority (desktop), full screen bookmark management with folder support, support for FLAC (Free Lossless Audio Codec) playback, ability to change the status bar color in themes, and removal of the Firefox Search widget from home screen (Android).
Firefox 58.0.1 was released on January 29, 2018 for desktop and Android. Among the fixes were a fix for an issue in which Firefox 58.0 would fail to load pages when using certain non-default security policies on Windows (desktop), and a fix for a performance issue whereby some installations were initially slow to load pages (Android).
Firefox 58.0.2 was released on February 7, 2018 for desktop and Android. Some fixes included one for a tab crash during printing, and one for clicking links and scrolling emails on Microsoft Hotmail and Outlook (OWA) webmail (desktop); and one for an issue in which, if the user cancels a download by exiting the app chooser dialogue without choosing anything, the download continues invisibly in the background (Android).
In January 2012, the Mozilla Foundation announced the availability of an Extended Support Release (ESR) version of Firefox. In addition to the "release", "beta", and "aurora" update channels the ESR versions form the "esr" update channel.
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.
An Extended Support Release includes continuity of support through 9 normal Firefox rapid release cycles (54 weeks), with the final 2 cycles overlapping the next version. ESR versions will jump from 10 to 17, then to 24 etc.
Every six weeks when a new mainstream Firefox release is made under the rapid release cycle, a corresponding security update would also be released for the then-current ESR version. For example, ESR 10.0.1 would be expected to be released at the same time as Firefox 11, ESR 10.0.2 at the same time as Firefox 12. Security updates for ESR versions are also released when out-of-band security updates are made available for mainstream Firefox releases, for example ESR 10.0.10 corresponds with Firefox 16.0.2. At Firefox 17 and Firefox 18, there would be two ESR versions supported. Respectively, ESR 10.0.11 and ESR 17.0.0; ESR 10.0.12 and ESR 17.0.1. Finally, when Firefox reaches 19.0, ESR 10 would go end-of-life alongside the release of ESR 17.0.2. The cycle repeats again.
After the end-of-life with ESR 10.0.12 the Firefox Updater suggested to update to ESR 17.0.x on supported platforms.
The numbering scheme changed somewhat starting with ESR 24.0.0 series. The first minor version number increments on regularly scheduled six-week release cycle, and the second minor version number increments when unscheduled off-cycle releases are necessary. For example, ESR 24.1.0 was released at the same time as 25.0.0, ESR 24.1.1 was released at the same time as 25.0.1, and ESR 24.2.0 was released at the same time as 26.0.0.
|"Operating system||Latest stable version||Support status|
|"Windows||"7 and later, "Server 2008 R2 and later||Current stable version: 58.0.2 (x64)||2015–|
|Older version, yet still supported: 52.6.0esr (x64)|
|Current stable version: 58.0.2 (IA-32)||2009–|
|Older version, yet still supported: 52.6.0esr (IA-32)|
|"XP, "Vista, "Server 2003
and "Server 2008
|Older version, yet still supported: 52.6.0esr (IA-32)||2004–2018|
|Old version, no longer supported: 52.0.2 (IA-32)||2004–2017|
|"2000||Old version, no longer supported: 10.0.12esr||2004–2013|
|Old version, no longer supported: 12.0||2004–2012|
|"NT 4 (IA-32), "98 and "ME||Old version, no longer supported: 188.8.131.52||2004–2008|
|"95||Old version, no longer supported: 184.108.40.206||2004–2007|
|"macOS||"10.9–"10.13||Current stable version: 58.0.2||2013–|
|Older version, yet still supported: 52.6.0esr|
|"10.6–"10.8||Old version, no longer supported: 45.9.0esr||2009–2017|
|Old version, no longer supported: 47.0.1||2009–2016|
|"10.5 (IA-32,x64)||Old version, no longer supported: 10.0.12esr||2007–2013|
|Old version, no longer supported: 16.0.2||2007–2012|
|"10.4 (IA-32,PPC)–"10.5 (PPC)||Old version, no longer supported: 3.6.28||2005–2012|
|"10.2–"10.3||Old version, no longer supported: 220.127.116.11||2004–2008|
|"10.0–"10.1||Old version, no longer supported: 1.0.8||2004–2006|
|"Linux desktop||Current stable version: 58.0.2 (x64)||2011–|
|Older version, yet still supported: 52.6.0esr (x64)|
|Current stable version: 58.0.2 (IA-32)||2004–|
|Older version, yet still supported: 52.6.0esr (IA-32)|
|"Operating system||Latest stable version||Support status|
|"Android (including "Android-x86)||"5.0 and later||Current stable version: 58.0.2 (ARMv8-A)||2017–|
|"4.1 and later||Current stable version: 58.0.2 (IA-32)||2013–|
|Current stable version: 58.0.2 (ARMv7)||2012–|
|"4.0||Old version, no longer supported: 55.0.2 (IA-32)||2013–2017|
|Old version, no longer supported: 55.0.2 (ARMv7)||2011–2017|
|"3.0||Old version, no longer supported: 45.0.2 (ARMv7)||2011–2016|
|"2.3||Old version, no longer supported: 47.0 (ARMv7)||2011–2016|
|"2.2–"4.3||Old version, no longer supported: 31.3.0esr (ARMv6)||2012–2015|
|"2.2||Old version, no longer supported: 31.0 (ARMv6)||2012–2014|
|Old version, no longer supported: 31.0 (ARMv7)||2011–2014|
|"2.1||Old version, no longer supported: 19.0.2 (ARMv6)||2012–2013|
|Old version, no longer supported: 19.0.2 (ARMv7)||2011–2013|
|"2.0||Old version, no longer supported: 6.0.2 (ARMv7)||2011|
|"Firefox OS||2.2||Old version, no longer supported: 35/36/37||2015|
|2.1||Old version, no longer supported: 33/34||2014–2015|
|2.0||Old version, no longer supported: 31/32||2014–2015|
|"Maemo||Old version, no longer supported: 7.0||2010–2011|
|"Operating system||Latest stable version||Support status||Notes|
|"Solaris||10 and OpenSolaris||Old version, no longer supported: 52.0.2esr (IA-32,SPARC V9)||2005–2017|
|8–9||Old version, no longer supported: 18.104.22.168 (IA-32,SPARC V9)||2004–2008|
|"FreeBSD||11||Current stable version: 58.0.2 (IA-32) and 58.0.2 (x64)||2016–|
|Older version, yet still supported: 52.6.0esr (IA-32) and 52.6.0esr (x64)|
|10||Current stable version: 58.0.2 (IA-32) and 58.0.2 (x64)||2014–|
|Older version, yet still supported: 52.6.0esr (IA-32) and 52.6.0esr (x64)|
|"OpenBSD||6.2||Current stable version: 58.0.2 (IA-32,x64)||2017–|
|Older version, yet still supported: 52.6.0esr (IA-32,x64)|
|6.1||Old version, no longer supported: 56.0 (IA-32,x64) and 52.4.0esr (IA-32,x64)||2017|
|6.0||Old version, no longer supported: 47.0.1 (IA-32,x64) and 45.2.0esr (IA-32,x64)||2016||Not maintained|
|5.9||Old version, no longer supported: 44.0.2 (IA-32,x64) and 38.8.0esr (IA-32,x64,PPC)||2016||Mainstream branch not maintained|
|5.8||Old version, no longer supported: 39.0.3 (IA-32,x64,PPC) and 38.7.1esr (IA-32,x64,PPC)||2015–2016|
|5.7||Old version, no longer supported: 35.0.1 (IA-32,x64,PPC) and 31.6.0esr (IA-32,x64,PPC,SPARC V9)||2015||Not maintained|
Version 35.0a2, first offered to Firefox Developer Edition users on November 10, 2014
about:configor with "add-ons (such as "NoScript).