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Mozilla Firefox
Mozilla Firefox logo 2013.svg
Firefox on Windows 8.1
Developer(s)Mozilla Foundation and contributors
Mozilla Corporation
Initial releaseSeptember 23, 2002; 11 years ago (2002-09-23)
Stable release

26.0 (December 10, 2013; 28 days ago (2013-12-10)[1]) [±]

ESR 24.2.0 (December 10, 2013; 28 days ago (2013-12-10)[2]) [±]
Preview release27.0 Beta 2 (December 17, 2013; 21 days ago (2013-12-17)[3][4]) [±]
Development statusActive
Written inC/C++,[5] JavaScript,[6] Cascading Style Sheets,[7] XUL, XBL
Operating systemWindows, OS X, Linux, Android,[8] Firefox OS, FreeBSD,[9] NetBSD,[10] OpenBSD, OpenIndiana[11]
Size22 MB: Windows[12][13]
44 MB: OS X[12]
27-28 MB: Linux[12]
22 MB: Android[14]
510 MB: source code[12]
Available in79 languages[15]
TypeWeb browser
Feed reader
Standard(s)HTML5, CSS3, RSS, Atom
Jump to: navigation, search
Mozilla Firefox
Mozilla Firefox logo 2013.svg
Firefox on Windows 8.1
Developer(s)Mozilla Foundation and contributors
Mozilla Corporation
Initial releaseSeptember 23, 2002; 11 years ago (2002-09-23)
Stable release

26.0 (December 10, 2013; 28 days ago (2013-12-10)[1]) [±]

ESR 24.2.0 (December 10, 2013; 28 days ago (2013-12-10)[2]) [±]
Preview release27.0 Beta 2 (December 17, 2013; 21 days ago (2013-12-17)[3][4]) [±]
Development statusActive
Written inC/C++,[5] JavaScript,[6] Cascading Style Sheets,[7] XUL, XBL
Operating systemWindows, OS X, Linux, Android,[8] Firefox OS, FreeBSD,[9] NetBSD,[10] OpenBSD, OpenIndiana[11]
Size22 MB: Windows[12][13]
44 MB: OS X[12]
27-28 MB: Linux[12]
22 MB: Android[14]
510 MB: source code[12]
Available in79 languages[15]
TypeWeb browser
Feed reader
Standard(s)HTML5, CSS3, RSS, Atom

Mozilla Firefox is a free and open-source[17] web browser developed for Windows, OS X, and Linux, with a mobile version for Android, by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. Firefox uses the Gecko layout engine to render web pages, which implements current and anticipated web standards.[18]

As of July 2013, Firefox has between 16% and 21% of worldwide usage, making it the third most popular web browser, according to different sources.[19][20][21][22] According to Mozilla, Firefox counts over 450 million users around the world.[23] The browser has had particular success in Indonesia, Germany, and Poland, where it is the most popular browser with 57%,[24] 45%,[25] and 44%[26] of the market share, respectively.


The Firefox project began as an experimental branch of the Mozilla project by Dave Hyatt, Joe Hewitt and Blake Ross. They believed the commercial requirements of Netscape's sponsorship and developer-driven feature creep compromised the utility of the Mozilla browser.[27] To combat what they saw as the Mozilla Suite's software bloat, they created a stand-alone browser, with which they intended to replace the Mozilla Suite. On April 3, 2003, the Mozilla Organization announced that they planned to change their focus from the Mozilla Suite to Firefox and Thunderbird.[28]

Phoenix 0.1 screenshot

The Firefox project has undergone several name changes. Originally titled Phoenix, it was renamed because of trademark problems with Phoenix Technologies. The replacement name, Firebird, provoked an intense response from the Firebird free database software project.[29][30] In response, the Mozilla Foundation stated that the browser should always bear the name Mozilla Firebird to avoid confusion with the database software. After further pressure from the database server's development community, on February 9, 2004, Mozilla Firebird became Mozilla Firefox,[31] often referred to as simply Firefox. Mozilla prefers that Firefox be abbreviated as Fx or fx, though it is often abbreviated as FF.[32] The Firefox project went through many versions before version 1.0 was released on November 9, 2004.


Features include tabbed browsing, spell checking, incremental find, live bookmarking, Smart Bookmarks, a download manager, private browsing, location-aware browsing (also known as "geolocation") based on a Google service[33] and an integrated search system that uses Google by default in most localizations. Functions can be added through extensions, created by third-party developers,[34] of which there is a wide selection, a feature that has attracted many of Firefox's users.

Additionally, Firefox provides an environment for web developers in which they can use built-in tools, such as the Error Console or the DOM Inspector, or extensions, such as Firebug.

Firefox 2 Tabbed Browsing GNU-Linux.png


The result of the Acid3 test on Firefox 17.

Firefox implements many web standards, including HTML4 (partial HTML5), XML, XHTML, MathML, SVG 1.1 (partial),[35] CSS (with extensions),[36] ECMAScript (JavaScript), DOM, XSLT, XPath, and APNG (Animated PNG) images with alpha transparency.[37] Firefox also implements standards proposals created by the WHATWG such as client-side storage,[38][39] and canvas element.[40]

Firefox has passed the Acid2 standards-compliance test since version 3.0.[41] Mozilla had originally stated that they did not intend for Firefox to pass the Acid3 test fully because they believed that the SVG fonts part of the test had become outdated and irrelevant, due to WOFF being agreed upon as a standard by all major browser makers.[42] Because the SVG font tests were removed from the Acid3 test in September 2011, Firefox 4 and greater scored 100/100.[43][44]

Firefox also implements[45] a proprietary protocol[46] from Google called "Safe Browsing", used to exchange data related with phishing and malware protection.


Firefox uses a sandbox security model,[47] and limits scripts from accessing data from other web sites based on the same-origin policy.[48] It uses SSL/TLS to protect communications with web servers using strong cryptography when using the HTTPS protocol.[49] It also provides support for web applications to use smartcards for authentication purposes.[50]

The Mozilla Foundation offers a "bug bounty" (up to 3000 USD cash reward and a Mozilla T-shirt) to researchers who discover severe security holes in Firefox.[51] Official guidelines for handling security vulnerabilities discourage early disclosure of vulnerabilities so as not to give potential attackers an advantage in creating exploits.[52]

Because Firefox generally has fewer publicly known unpatched security vulnerabilities than Internet Explorer (see Comparison of web browsers), improved security is often cited as a reason to switch from Internet Explorer to Firefox.[53][54][55][56] The Washington Post reports that exploit code for known critical unpatched security vulnerabilities in Internet Explorer was available for 284 days in 2006. In comparison, exploit code for known, critical security vulnerabilities in Firefox was available for 9 days before Mozilla issued a patch to remedy the problem.[57]

A 2006 Symantec study showed that, although Firefox had surpassed other browsers in the number of vendor-confirmed vulnerabilities that year through September, these vulnerabilities were patched far more quickly than those found in other browsers – Firefox's vulnerabilities were fixed on average one day after the exploit code was made available, as compared to nine days for Internet Explorer.[58] Symantec later clarified their statement, saying that Firefox still had fewer security vulnerabilities than Internet Explorer, as counted by security researchers.[59]

In 2010 a study of the National Institute of Standards and Technology (NIST) based on data compiled from the National Vulnerability Database (NVD) Firefox was listed as the 5th most vulnerable desktop software, Internet Explorer ranked 8th, and Google Chrome as 1st.[60]

InfoWorld has cited security experts saying that as Firefox becomes more popular, more vulnerabilities will be found,[61] a claim that Mitchell Baker, president of the Mozilla Foundation, has denied: "There is this idea that market share alone will make you have more vulnerabilities. It is not relational at all."[62]

In October 2009, Microsoft's security engineers acknowledged that Firefox was vulnerable since February of that year due to a .NET Framework 3.5 SP1 Windows Update that silently installed a buggy 'Windows Presentation Foundation' plug-in into Firefox.[63] This vulnerability has since been patched by Microsoft.[64]

As of February 11, 2011, Firefox 3.6 had no known unpatched security vulnerabilities according to Secunia.[65] Internet Explorer 8 had five unpatched security vulnerabilities, the worst being rated "Less Critical" by Secunia.[66]

Mozilla claims that all patched vulnerabilities of Mozilla products are publicly listed.[67]

On January 28, 2013, Mozilla was recognized as the most trusted internet company for privacy in 2012.[68] This study was performed by Ponemon Institute and was a result of a survey from more than 100,000 consumers in the United States.

In February 2013, plans were announced for Firefox 22 to disable third-party cookies by default. However, the introduction of the feature has since been delayed so Mozilla developers can "collect and analyze data on the effect of blocking some third-party cookies." Mozilla has also collaborated with Stanford University's "Cookie Clearinghouse" project to develop a blacklist and whitelist of sites that will be used in the filter.[69][70]

Starting from version 23, "Enable JavaScript" preference checkbox has been removed and user-set values will be reset to the default (JavaScript is enabled for all sites).[71] Users can disable JavaScript via about:config or by extensions such as NoScript, and from Firefox 24, via developer tools.[72] This change was considered as a bug by some users, however, Mozilla developer marked this report as INVALID ("INVALID" means "The problem described is not a bug").[73]


When Firefox is upgraded to version 7.0, an information bar will appear asking users whether they would like to send performance statistics (also known as “telemetry”) to Mozilla. According to Mozilla's privacy policy,[74] these statistics are stored only in aggregate format, and the only personally identifiable information transmitted is the user's IP address.


Firefox 22 in the Portuguese language.

Firefox is a widely localized web browser. The first official release in November 2004 was available in 24 different languages and for 28 locales, including British English/American English, European Spanish/Argentine Spanish and Chinese in Traditional Chinese characters/Simplified Chinese characters.[75] The currently supported 24.2.0esr and 26.0 versions are available in 89 locales (79 languages).[15]

Platform availability[edit]

Firefox for desktop is available and supported for Windows, OS X, FreeBSD, and Linux. Firefox for mobile is available for Android. In September 2013, a "Metro" app version of Firefox for Windows 8, optimized for touchscreen use, was introduced on the "Aurora" release channel.[76][77]


Firefox running on a digital advertising sign (identifiable by its connection failure message)

Mozilla provides development builds of Firefox in the following channels: "Beta", "Aurora", and "Nightly". As of 10 December 2013 (2013-12-10), Firefox 27 beta is in the "Beta" channel, Firefox 28 alpha is in the "Aurora" channel, and Firefox 29 pre-alpha is in the "Nightly" channel.[78]

Firefox for mobile[edit]

Firefox for mobile 14.0 on Android

Firefox for mobile, codenamed Fennec, is a web browser for smaller non-PC devices, mobile phones and PDAs. It was first released for the Nokia Maemo operating system (specifically the Nokia N900) on January 28, 2010.[79] Version 4 for Android and Maemo was released on March 29, 2011.[80] The browser's version number was bumped from version 2 to version 4 to synchronize with all future desktop releases of Firefox since the rendering engines used in both browsers are the same.[81] Version 7 was the last release for Maemo on the N900.[82] The user interface is completely redesigned and optimized for small screens, the controls are hidden away so that only the web content is shown on screen, and it uses touchscreen interaction methods. It includes the Awesomebar, tabbed browsing, Add-on support, password manager, location-aware browsing, and the ability to synchronize with the user's computer Firefox browser using Firefox Sync.[83]

Extended Support Release[edit]

Firefox ESR is a version of Firefox for organizations and other adopters who need extended support for mass deployments, with each ESR release being supported for approximately one year.[84] Unlike the regular ("rapid") releases, the ESR will not be updated with new features and performance enhancements every six weeks, but rather is updated with only high-risk/high-impact security fixes or major stability fixes with point releases, until the end of the ESR cycle.[85] Firefox has had 3 Extended Support Releases thus far: 10.x, 17.x, and 24.x - these came out on the same day as the corresponding rapid release versions, and shared the same feature set as the rapid release versions as well.

System requirements[edit]

Firefox source code may be compiled for various operating systems; however, officially distributed binaries are meant for the following:

Recommended hardware and required software[86]
WindowsLinux desktopOS XAndroid[87]
CPUPentium 4 or newer with SSE2Any Intel CPUARMv7 CPU
(ARMv6 also works[88])
Memory (RAM)512 MB384 MB
Hard disk drive free space200 MB24 MB
Operating system versionXP SP2 (desktop)
Server 2003 SP1 (server)
or newer
Kernel 2.2.14 or newer with: OS X 10.6 or newer2.2 or newer[87]

Display size (on mobile) must be at least 320 pixels high and 240 pixels wide.[87]

OS support history[edit]

Operating systemLatest stable versionSupport status
Microsoft WindowsXP SP2/SP3 / 2003 SP1/SP2/R2 / Vista /
2008 / 7 / 2008R2 / 8 / 2012
26.0 and 24.2.0esr[89]2004–present
2000 / XP RTM/SP1 / 2003 RTM10.0.12esr[90] and 12.02004–2013
NT 4 / 98 / ME2.0.0.202004–2008
OS X10.610.926.0 and 24.2.0esr[89]2009–present
10.5 (Intel)10.0.12esr and 16.0.2[91]2007–2013
10.410.5 (PPC)3.6.28[92][93]2005–2012–2008–2006
LinuxDesktop kernel 2.2.14 and newer
(with some libraries[89])
26.0 and 24.2.0esr[89]2004–present
Firefox OS18.02013–present


CPU architecture[edit]

Native 64-bit builds are officially supported on Linux and OS X, but not on Windows:[78]

Operating system32-bit support64-bit support
OS X[b]Yes
Windows[c]YesNightly build[99]


^[a] Linux: Mozilla made Firefox for 64-bit Linux a priority with the release of Firefox 4, labeling it as tier 1 priority.[78][100] Since being labeled tier 1, Mozilla has been providing official 64-bit releases for its browser for Linux.[101][102] Vendor-backed 64-bit support has existed for Linux distributions such as Novell-Suse Linux, Red Hat Enterprise Linux, and Ubuntu prior to Mozilla's support of 64-bit, even though vendors were faced with the challenge of having to turn off the 64-bit JIT compiler due to its instability prior to Firefox 4.[103][104][105]
^[b] OS X: The official releases of Firefox for OS X are universal builds that include both 32-bit and 64-bit versions of the browser in one package, and have been this way since Firefox 4. A typical browsing session uses a combination of the 64-bit browser process and a 32-bit plugin process, because some popular plugins still are 32-bit.[106]
^[c] Windows: The 32-bit and 64-bit versions of Windows Vista and Windows 7 can be used to run 32-bit Firefox.[86] Mozilla does not currently support Win64 because many plug-ins do not yet support Win64 and other issues.[78] Mozilla provides 64-bit versions for their Firefox nightly builds, however, the builds were never considered stable by Mozilla.[107][108] Mozilla tried to stop the releases,[99] but did not.[109]


Firefox source code is free software, with most of it being released under the Mozilla Public License (MPL).[16] This license permits anyone to view, modify, and/or redistribute the source code, and several publicly released applications have been built on it; for example, Netscape, Flock, Miro, Iceweasel, and Songbird make use of code from Firefox.

In the past, Firefox was licensed solely under the MPL, then version 1.1,[110] which the Free Software Foundation criticized for being weak copyleft; the license permitted, in limited ways, proprietary derivative works. Additionally, code only licensed under MPL 1.1 could not legally be linked with code under the GPL.[111][112] To address these concerns, Mozilla re-licensed most of Firefox under the tri-license scheme of MPL 1.1, GPL 2.0, or LGPL 2.1. Since the re-licensing, developers were free to choose the license under which they received most of the code, to suit their intended use: GPL or LGPL linking and derivative works when one of those licenses is chosen, or MPL use (including the possibility of proprietary derivative works) if they chose the MPL.[110] However, on January 3, 2012, Mozilla released the GPL-compatible MPL 2.0,[113] and with the release of Firefox 13 on June 5, 2012, Mozilla used it to replace the tri-licensing scheme.[114]

The crash reporting service was initially closed source, but switched with version 3 from a program called Talkback to the open source Breakpad & Socorro.


The name "Mozilla Firefox" is a registered trademark; along with the official Firefox logo, it may only be used under certain terms and conditions. Anyone may redistribute the official binaries in unmodified form and use the Firefox name and branding for such distribution, but restrictions are placed on distributions which modify the underlying source code.[115] The name "Firefox" derives from a nickname of the red panda.[116]

Mozilla has placed the Firefox logo files under open-source licenses,[117][118] but its trademark guidelines do not allow displaying altered[119] or similar logos[120] in contexts where trademark law applies.

Logo used for Iceweasel

There has been some controversy over the Mozilla Foundation's intentions in stopping certain open source distributions from using the "Firefox" trademark.[17] Mozilla Foundation Chairperson Mitchell Baker explained in an interview in 2007 that distributions could freely use the Firefox trademark if they did not modify source-code, and that the Mozilla Foundation's only concern was with users getting a consistent experience when they used "Firefox".[121]

To allow distributions of the code without using the official branding, the Firefox source code contains a "branding switch". This switch allows the code to be compiled without the official logo and name, for example to produce a derivative work unencumbered by restrictions on the Firefox trademark (this is also often used for alphas of future Firefox versions). In the unbranded compilation the trademarked logo and name are replaced with a freely distributable generic globe logo and the name of the release series from which the modified version was derived.

Distributing modified versions of Firefox under the "Firefox" name requires explicit approval from Mozilla for the changes made to the underlying code, and requires the use of all of the official branding. For example, it is not permissible to use the name "Firefox" without also using the official logo. When the Debian project decided to stop using the official Firefox logo in 2006 (because Mozilla's copyright restrictions at the time were incompatible with Debian's guidelines), they were told by a representative of the Mozilla Foundation that this was not acceptable, and were asked either to comply with the published trademark guidelines or cease using the "Firefox" name in their distribution.[122] Ultimately, Debian switched to branding their modified version of Firefox "Iceweasel", along with other Mozilla software.

Branding and visual identity[edit]

Early Firebird and Phoenix releases of Firefox were considered to have had reasonable visual designs, but were not up to the same standards as many professionally released software packages. In October 2003, professional interface designer Steven Garrity wrote an article covering everything he considered to be wrong with Mozilla's visual identity.[123] The page received a great deal of attention; the majority of criticism leveled at the article fell along the lines of "where's the patch?"[citation needed]

Blue globe artwork is distributed with Firefox source code, and is explicitly not protected as a trademark[124]

Shortly afterwards, Garrity was invited by the Mozilla Foundation to head up the new visual identity team. The release of Firefox 0.8 in February 2004 saw the introduction of the new branding efforts, including new icon designs by silverorange, a group of web developers with a long-standing relationship with Mozilla, with final renderings by Jon Hicks, who had previously worked on Camino.[125][126] The logo was later revised and updated, fixing several flaws found when it was enlarged.[127]

The animal shown in the logo is a stylized fox, although "firefox" is considered to be a common name for the red panda. The panda, according to Hicks, "didn't really conjure up the right imagery" and wasn't widely known.[126] The logo was chosen to make an impression while not shouting out with overdone artwork. It had to stand out in the user's mind, be easy for others to remember, and stand out without causing too much distraction when seen among other icons.

The Firefox icon is a trademark used to designate the official Mozilla build of the Firefox software and builds of official distribution partners.[128] For this reason, Debian and other software distributors who distribute patched or modified versions of Firefox do not use the icon.

Logo history:

Other logos are also used for specific versions of the software:


The rapid adoption of Firefox, 100 million downloads in its first year of availability,[130] followed a series of aggressive marketing campaigns starting in 2004 with a series of events Blake Ross and Asa Dotzler called "marketing weeks".[131]

On September 12, 2004,[132] a marketing portal dubbed "Spread Firefox" (SFX) debuted along with the Firefox Preview Release, creating a centralized space for the discussion of various marketing techniques. A two-page ad in the December 16 edition of the New York Times, placed by Mozilla Foundation in coordination with Spread Firefox, featured the names of the thousands of people worldwide who contributed to the Mozilla Foundation's fundraising campaign to support the launch of the Firefox 1.0 web browser.[133] SFX portal enhanced the "Get Firefox" button program, giving users "referrer points" as an incentive. The site lists the top 250 referrers. From time to time, the SFX team or SFX members launch marketing events organized at the Spread Firefox website. As a part of the Spread Firefox campaign, there was an attempt to break the world download record with the release of Firefox 3.[134] This resulted in an official certified Guinness world record, with over eight million downloads.[135]

The "World Firefox Day" campaign started on July 15, 2006,[136] the third anniversary of the founding of the Mozilla Foundation,[137] and ran until September 15, 2006.[138] Participants registered themselves and a friend on the website for nomination to have their names displayed on the Firefox Friends Wall, a digital wall that will be displayed at the headquarters of the Mozilla Foundation.

In December 2007, Mozilla launched Live Chat, a service allowing users to seek technical support from volunteers. Because Live chat is kept running by volunteers, it is only available when they are online.[139]

On February 21, 2008 in honor of reaching 500 million downloads, the Firefox community celebrated by visiting FreeRice to earn 500 million grains of rice.[140]

Some of Firefox's contributors made a crop circle of the Firefox logo in an oat field near Amity, Oregon, near the intersection of Lafayette Highway and Walnut Hill Road.[141]

In February 2011, Mozilla announced that it would be retiring Spread Firefox (SFX). Three months later, in May 2011, Mozilla officially closed Spread Firefox. Mozilla wrote that "there are currently plans to create a new iteration of this website [Spread Firefox] at a later date."[142]


In December 2005, Internet Week ran an article in which many readers reported high memory usage in Firefox 1.5.[143] Mozilla developers said that the higher memory use of Firefox 1.5 was at least partially due to the new fast backwards-and-forwards (FastBack) feature.[144] Other known causes of memory problems were malfunctioning extensions such as Google Toolbar and some older versions of AdBlock,[145] or plug-ins, such as older versions of Adobe Acrobat Reader.[146] When PC Magazine compared memory usage of Firefox 2, Opera 9, and Internet Explorer 7, they found that Firefox used approximately as much memory as the other two browsers.[147]

Softpedia noted that Firefox 1.5 took longer to start up than other browsers,[148] which was confirmed by further speed tests.[149] IE 6 launched more swiftly than Firefox 1.5 on Windows XP since many of its components were built into the OS and loaded during system startup. As a workaround for the issue, a preloader application was created that loaded components of Firefox on startup, similar to Internet Explorer.[150] A Windows Vista feature called SuperFetch performs a similar task of preloading Firefox if it is used often enough.

Tests performed by PC World and Zimbra in 2006 indicated that Firefox 2 used less memory than Internet Explorer 7.[151][152] Firefox 3 used less memory than Internet Explorer 7, Opera 9.50 Beta, Safari 3.1 Beta, and Firefox 2 in tests performed by Mozilla, CyberNet, and The Browser World.[153][154][155] In mid-2009, Betanews benchmarked Firefox 3.5 and declared that it performed "nearly ten times better on XP than Microsoft Internet Explorer 7".[156]

In January 2010, Lifehacker compared the performance of Firefox 3.5, Firefox 3.6, Google Chrome 4 (stable and Dev versions), Safari 4, and Opera (10.1 stable and 10.5 pre-alpha versions). Lifehacker timed how long browsers took to start and reach a page (both right after boot-up and after running at least once already), timed how long browsers took to load nine tabs at once, tested JavaScript speeds using Mozilla's Dromaeo online suite (which implements Apple's SunSpider and Google's V8 tests) and measured memory usage using Windows 7's process manager. They concluded that Firefox 3.5 and 3.6 were the fifth and sixth fastest browsers respectively on startup, 3.5 was third and 3.6 was sixth fastest to load nine tabs at once, 3.5 was sixth and 3.6 was fifth fastest on the JavaScript tests. They also concluded that Firefox 3.6 was the most efficient with memory usage followed by Firefox 3.5.[157]

In February 2012, Tom's Hardware performance tested Chrome 17, Firefox 10, Internet Explorer 9, Opera 11.61, and Safari 5.1.2 on Windows 7. Tom's Hardware summarized their tests into four categories: Performance, Efficiency, Reliability, and Conformance. In the performance category they tested HTML5, Java, JavaScript, DOM, CSS 3, Flash, Silverlight, and WebGL – they also tested start up time and page load time. The performance tests showed that Firefox was either "acceptable" or "strong" in most categories, winning three categories (HTML5, HTML5 Hardware acceleration, and Java) only finishing "weak" in CSS performance. In the efficiency tests, Tom's Hardware tested memory usage and management. In this category, it determined that Firefox was only "acceptable" at performing light memory usage, while it was "strong" at performing heavy memory usage. In the reliability category, Firefox performed a "strong" amount of proper page loads. In the final category, conformance, it was determined that Firefox had "strong" conformance for JavaScript and HTML5. In conclusion, Tom's Hardware determined that Firefox was the best browser for Windows 7 OS, but that it only narrowly beat Google Chrome.[158]

Market adoption[edit]

Usage share of web browsers (November 2012 – StatCounter)

Downloads have continued at an increasing rate since Firefox 1.0 was released in November 2004, and as of July 31, 2009 Firefox had already been downloaded over one billion times.[159] This number does not include downloads using software updates or those from third-party websites.[160] They do not represent a user count, as one download may be installed on many machines, one person may download the software multiple times, or the software may be obtained from a third party. According to Mozilla, Firefox has more than 450 million users as of October 2012.[23][161]

In July 2010, all IBM employees (about 400,000) were asked to use Firefox as their default browser.[162]

Firefox was the second-most used web browser until December 2011, when Google Chrome surpassed it.[163]

As of May 2012, Firefox was the third most widely used browser, with approximately 25% of worldwide usage share of web browsers.[19][21][22] According to StatCounter, Firefox usage peaked in November 2009 and usage share remained stagnant until October 2010 when it lost market share, a trend that continued for over a year. Its first consistent gains in usage share since September 2010 occurred in February through May 2012 before declining again in June and July.[21]

Release history[edit]

RedFormer release; no longer supported
YellowFormer release; still supported
GreenCurrent supported release
Release history
VersionRelease dateGecko
Release notes
  • Web form auto-complete
  • Sidebar is back
    • Downloads Sidebar
    • Bookmarks Sidebar
    • History Sidebar
  • Extension management
  • Toolbar customization
  • Search bar
  • Improved preference defaults
  • Speed improvements
  • Ctrl+Mousewheel to resize fonts
  • Bug fixes[165]
  • Image Blocking
  • Pop-up Blocking Whitelist
  • Bookmarks Changes
  • Global Go Menu and Other Menu Changes
  • Tabbed Browsing Improvements
  • Size and Speed Improvements
  • Bug fixes[166]
  • Improvements to pop-up blocking
  • Improvements to toolbar customization
  • Improvements to tabbed browsing and shortcut keys
  • Type ahead find returns
  • Address bar gets smarter
  • Themes
  • Bug fixes[167]
  • Multiple homepages
  • Intellimouse 5-button support
  • Sidebar remembers its state across sessions
  • Download fixes
  • History improvements
  • Accessibility improvements
  • Size and memory reduction
  • Performance improvements
  • Stability improvements
  • Better Windows appearance
  • Many more new themes
  • Many bug fixes[168]
  • New default theme
  • Redesigned Preferences window
  • Improved Privacy Options
  • Improved Bookmarks
  • Talkback enabled to tell Mozilla why the browser crashed
  • Automatic Image Resizing
  • Smooth Scrolling
  • Access to more preferences through about:config
  • Custom profile save location
  • Mac OS X compatibility
  • Lots of bug fixes[169]
  • Advanced preferences panel
  • Download/helper apps preferences panel
  • Cookie whitelisting
  • New password manager (all passwords now stored encrypted[170])
  • Web panels (like Mozilla's sidebar panels)
  • Alternate stylesheet support (through a status bar button)
  • Send Page, Send Link, and Send Image menu items
  • Autoscroll
  • Lots of bug fixes and other small improvements[171]
  • Windows Installer
  • Download Manager
  • New Add Bookmark Dialog
  • Work Offline
  • Better Handling of File Types
  • New XPInstall Frontend
  • New default theme for Mac OS X
  • Lots of bug fixes and improvements [172]
  • New Default Theme
  • Comprehensive Data Migration from Internet Explorer
  • Extension/Theme Manager
  • Smaller Download
  • Online help system
  • Lots of bug fixes and improvements[173]
  • Better Tabbed Browsing Controls
  • Horde of bug fixes[174]
  • Security fixes
  • Bug fixes
  • Stability fixes[175]
  • Last release for Windows 95
  • Bug fixes
  • Stability fixes
  • Security fixes[177]
  • Visual Refresh of main theme
  • Built-in phishing protection
  • Enhanced search capabilities
  • Improved tabbed browsing
  • Resuming your browsing session (session restore)
  • Previewing and subscribing to Web feeds
  • Inline spell checking
  • Live Web Titles
  • Improved Add-ons manager
  • JavaScript 1.7
  • Extended search plugin format (predictive search)
  • Improved security with extension system
  • Client-side session and persistent storage
  • SVG text support
  • New Windows installer[178]
  • Last release for Windows NT 4.0, 98, Me.
  • Bug fixes
  • Security fixes
  • Stability fixes[179]
  • One-click site info
  • Malware Protection
  • New Web Forgery Protection page
  • New SSL error pages
  • Add-ons and Plugin version check
  • Secure add-on updates
  • Anti-virus integration with download manager
  • Vista Parental Controls
  • Effective top-level domain (eTLD) service better restricts cookies and other restricted content to a single domain.
  • Better protection against cross-site JSON data leaks.
  • Easier password management – save passwords after successful login
  • Simplified add-on installation from third party’s
  • New Download Manager
  • Resumable downloading after closing the browser
  • Full page zoom
  • Podcasts and Videocasts can be associated with your media playback tools
  • Tab scrolling and quickmenu
  • Save what you were doing - Firefox 3 will prompt users to save tabs on exit.
  • Optimized Open in Tabs behavior
  • Location and Search bar size can now be customized with a simple resizer item.
  • Text selection improvements (select multiple selections of text)
  • Find toolbar: the Find toolbar now opens with the current selection.
  • Plugin management with the add-on manager
  • Improved integration with Windows
  • Improved integration with the Mac
  • Integration with Linux GTK theme
  • Bookmark star button
  • Bookmark tags
  • Smart Location Bar
  • Library of bookmarks, history, etc.
  • Smart Bookmark Folders
  • Web-based protocol handlers for mail:to
  • Download & Install Add-ons from the Add-on manager
  • Easy to use Download Actions
  • New graphics and font handling in Gecko 1.9 provide rendering improvements in:
  • CSS
  • SVG
  • Display of fonts with ligatures and complex scripts
  • Color management of images with capabilities
  • Offline support for web applications
  • Improved speed
  • Reduced memory usage
  • Increased reliability
  • 25000 total code changes
  • Security fixes
  • Stability fixes[180]
  • Fixed several security problems.
  • Fixed several stability issues.[181]
  • Support for the HTML5 <video> and <audio> elements including native support for Ogg Theora video and Vorbis audio
  • Improved tools for controlling your private data, including a Private Browsing Mode
  • Better web application performance using the new TraceMonkey JavaScript engine
  • The ability to share your location with websites using Location Aware Browsing
  • Support for native JSON, and web worker threads
  • Improvements to the Gecko layout engine, including speculative parsing for faster content rendering
  • Support for new web technologies such as:
    • Downloadable fonts
    • CSS media queries
    • New transformations and properties
    • JavaScript query selectors
    • HTML5 local storage and offline application storage
    • <canvas> text
    • ICC profiles
    • SVG transforms.[182]
  • Fixed several security issues
  • Fixed several stability issues[183]
  • Support for Persona themes
  • Protection from out-of-date plugins to keep users safer as they browse.
  • Open, native video can now be displayed full screen and supports poster frames.
  • Improved JavaScript performance, overall browser responsiveness, and startup time.
  • The ability for web developers to indicate that scripts should run asynchronously to speed up page load times.
  • Continued support for downloadable web fonts using the new WOFF font format.
  • Support for new CSS attributes such as gradients, background sizing, and pointer events.
  • Support for new DOM and HTML5 specifications including the Drag & Drop API and the File API, which allow for more interactive web pages.
  • Changes to how third-party software can integrate with Firefox in order to prevent crashes.[184]
  • Last release for Mac OS X Tiger and PowerPC Macs
  • Added Out-of-process plugins[185]
  • Fixed several security issues
  • Fixed several stability issues[186]
  • Firefox 4 is available in over 80 languages
  • Uses JägerMonkey, a faster JavaScript engine
  • Support for Do Not Track ("DNT") header that allows users to opt-out of behavioral advertising
  • Firefox Sync is included by default
  • Graphic rendering is now hardware-accelerated using Direct3D 9 (Windows XP), Direct3D 10 (Windows Vista & 7), and OpenGL on Mac OS
  • Direct2D Hardware Acceleration is now on by default for Windows 7 users
  • WebGL is enabled on all platforms that have a capable graphics card with updated drivers
  • Native support for the HD HTML5 WebM video format, hardware accelerated where available
  • Firefox button has a new look for Windows Vista and Windows 7 users
  • Tabs are now on top by default on Windows, Mac OS X, and Linux
  • You can search for and switch to already open tabs in the Smart Location Bar
  • The stop and reload buttons have been merged into a single button on Windows, Mac OS X, and Linux
  • The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you'd like)
  • Crash protection when there is a crash in Adobe Flash Player, Apple QuickTime or Microsoft Silverlight plugins
  • You can turn any tab into an "App Tab"
  • The default homepage design has been refreshed
  • Overhaul of the bookmarks and history code, enabling faster bookmarking and startup performance
  • Per-compartment garbage collection is now enabled, reducing work done during complex animations
  • Additional polish for the Firefox add-on Manager
  • Improved web typography using OpenType with support for ligatures, kerning and font variants
  • Web developers can animate content using CSS Transitions
  • Responsiveness and scrolling improvements from the new retained layers layout system
  • HTML5 Forms API makes web based forms easier to implement and validate
  • Support for the new proposed Audio Data API
  • Support for HSTS security protocol allowing sites to insist that they only be loaded over SSL
  • A new feature called Panorama gives users a visual overview of all open tabs, allowing them to be sorted and grouped
  • An experimental API is included to provide more efficient JavaScript animations
  • Firefox now supports the HTML5 video "buffered" property
  • Changes to how XPCOM components are registered in order to help startup time and process separation
  • New Addons Manager and extension management API
  • Significant API improvements are available for JS-ctypes, a foreign function interface for extensions
  • CSS Transitions are partially supported
  • Core Animation rendering model for plugins on Mac OS X
  • Web developers can update the URL field without reloading the page using HTML History APIs
  • More responsive page rendering using lazy frame construction
  • Link history lookup is done asynchronously to provide better responsiveness during pageload
  • CSS :visited selectors have been changed to block websites from being able to check a user's browsing history
  • New HTML5 parser
  • Support for more HTML5 form controls
  • Web authors can now get touch events from Firefox users on Windows 7 machines
  • A new way of representing values in JavaScript that allows Firefox to execute heavy, numeric code more efficiently[187]
  • Fixed several security issues
  • Fixed several stability issues[188]
  • Fixed an issue in Mac OS X 10.7 that could cause Firefox to crash[196]
  • Fixed an issue caused by Apple's "Java for Mac OS X 10.6 Update 5" where the Java plugin would not be loaded[197]
  • 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 are 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 window.matchMedia
  • 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 issues
  • Fixed several security issues[198]
  • Revoked the root certificate for DigiNotar due to fraudulent SSL certificate issuance[199]
  • Removed trust exceptions for certificates issued by Staat der Nederlanden
  • Resolved an issue with websites[200]
  • 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 'http://' 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 stability issues
  • Fixed several security issues[201]
  • Fixed a rare issue where some users could find one or more of their add-ons hidden after a Firefox update[202]
  • 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 start-up 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 insertAdjacentHTML()
  • Improved CSS hyphen support for many languages
  • Improved WebSocket support
  • Fixed several stability issues[203]
  • 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.[204]
  • 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 font-stretch CSS property.
  • Improved support for the text-overflow CSS property.
  • Improved standards support for HTML5, MathML, and CSS.
  • Fixed several stability issues.[205]
  • Fixed crash on Windows, Mac and Linux[206]
  • 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.[207]
  • Fixed Java applets that sometimes caused text input to become unresponsive.[209]
  • Security fixes.[210]
  • Fixed web workers running out of memory, affecting some add-ons used by organizations.[211]
  • 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.[212]
  • Fixed the 10.0.5 Firefox top crash with signature [@ GLEngine@0x620cf ].[213]
  • Security fixes.
  • Stability fixes.
  • Fixed some text editing inconsistencies.[214]
  • 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.[215]
  • Migration of settings from Google Chrome
  • SPDY protocol support (disabled by default)
  • RFC 6455 WebSocket protocol support with an unprefixed API
  • Page Inspector Tilt (3D View)
  • Sync Add-ons
  • Redesigned HTML5 video controls
  • Style Editor (CSS)[221]
  • Windows: Firefox is now easier to update with one less prompt (User Account Control)
  • Last release for Windows 2000
  • 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
  • Various security fixes
  • Many bug fixes
    • Some TinyMCE-based editors failed to load (739141)
    • OS X: WebGL performance may be degraded on some hardware (713305)[222]
  • 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[223]
  • 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
  • Various security fixes[224]
  • 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
  • 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[225][226]
  • Long URLs now extend the status bar almost to the whole width of the viewport.
  • Gstreamer backend for HTML5 video to allow H.264 playback (needs to be enabled at compile time).
  • Various security fixes
  • 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[227]
  • 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[228]
  • Addressed a fix where sites visited while in Private Browsing mode could be found through manual browser cache inspection[229]
  • Firefox on Mac OS X now has preliminary VoiceOver support turned on by default
  • Last release for Mac OS X Leopard (Intel)
  • 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[230]
  • Fixed security vulnerabilities[231]
  • Fixed security vulnerability[232]
  • 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[233]
  • Reverted user agent change causing some website incompatibilities
  • Fixed font rendering issue[234]
  • Security and stability fixes.
  • Fixed improvements to the Click-to-Play vulnerable plugin blocklisting feature[235]
  • Updated ESR17 to NSS 3.14.5 RTM.[244]
  • 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 window.devicePixelRatio
  • 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[245]
  • Fixed problems involving HTTP Proxy Transactions
  • Fixed unity player crashes on Mac OS X
  • Disabled HIDPI support on external monitors to avoid rendering glitches[246]
  • Fixed JavaScript related stability issues[247]
  • Built-in PDF Viewer
  • Canvas elements can export their content as an image blob using canvas.toBlob()
  • 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 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[248]
  • Windows 8 only: Fixed stability issue for some AMD Radeon HD graphics cards[249]
  • Security-driven release[250]
  • Security fixes
  • 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 - clear() and Math.imul
  • New JavaScript Profiler tool
  • getUserMedia implemented for web access to the user's camera and microphone (with user permission)
  • <canvas> now supports blend modes
  • Various <audio> and <video> improvements
  • Fixed: Details button on Crash Reporter
  • Fixed: Unity plugin that doesn't display in HiDPI mode[251]
  • Windows-only update to handle issues around handling UNC paths[252]
  • 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 <main> 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
  • Security fixes[253]
  • 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 <data> and <time> elements
  • Fixed: Scrolling using some high-resolution-scroll aware touchpads feels slow[254]
  • 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
  • Updated Firefox Logo
  • 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
  • <input type='file'> rendering improvements
  • Replaced fixed-ratio audio resampler in 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 <input type="range"> 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 <blink> element
  • New feature in toolbox: Network Monitor
  • Various security fixes[255]
  • Fixed rendering glitches on H.264 video only in FF23 on Vista
  • Fixed spellchecking that was broken with non-ASCII characters in profile path
  • Fixed audio static/"burble"/breakup in Firefox to Firefox WebRTC calls[256]
  • 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 capture code with Speex resampler and eliminated pseudo-44,000  rate
  • Security fixes[257]
  • 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[259]
  • 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
  • iframe document content can now be specified inline
  • Fixed blank or missing page thumbnails when opening a new tab[261]
  • Security fixes
  • Fixed pages that sometimes wouldn't load without first moving the cursor[262]
  • 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 OS X
  • Various security fixes[263]
VersionRelease dateGecko
Release notes

See also[edit]


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  2. ^ "Firefox ESR 24.2.0 Notes". December 10, 2013. Retrieved December 10, 2013. 
  3. ^ "Firefox Beta Notes Desktop". 2013-12-12. Retrieved 2013-12-13. 
  4. ^ "Firefox web browser | Help us test the latest beta". Retrieved 2013-12-17. 
  5. ^ "Languages summary". 
  6. ^ "Firefox's addons are written in JavaScript". Rietta. Retrieved December 19, 2009. 
  7. ^ "Firefox uses an "html.css" stylesheet for default rendering styles". David Walsh. Retrieved December 19, 2009. 
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  9. ^ a b FreeBSD port of Firefox
  10. ^ NetBSD binary package of Firefox 24
  11. ^ Source package of Firefox 3.6.15
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Further reading[edit]

  • Cheah, Chu Yeow (2005). Firefox Secrets: A Need-To-Know Guide. O'Reilly. ISBN 0-9752402-4-2. 
  • Feldt, Kenneth C. (2007). Programming Firefox. O'Reilly. ISBN 0-596-10243-7. 
  • Granneman, Scott (2005). Don't Click on the Blue e!: Switching to Firefox. O'Reilly. ISBN 0-596-00939-9. 
  • Hofmann, Chris; Marcia Knous, & John Hedtke (2005). Firefox and Thunderbird Garage. Prentice Hall PTR. ISBN 0-13-187004-1. 
  • McFarlane, Nigel (2005). Firefox Hacks. O'Reilly. ISBN 0-596-00928-3. 
  • Reyes, Mel (2005). Hacking Firefox: More Than 150 Hacks, Mods, and Customizations. Wiley. ISBN 0-7645-9650-0. 
  • Ross, Blake (2006). Firefox for Dummies. Wiley. ISBN 0-471-74899-4. 

External links[edit]