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Mozilla Firefox, or simply Firefox, is a free and open-source web browser developed 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. In 2017, Firefox began incorporating new technology under the code name Quantum to promote parallelism and a more intuitive user interface. Firefox is officially available for Windows 7 or newer, macOS, and Linux. Its unofficial ports are available for various Unix and Unix-like operating systems including FreeBSD, OpenBSD, NetBSD, illumos, and Solaris Unix. Firefox is also available for Android and iOS; however, the iOS version uses the WebKit layout engine instead of Gecko due to platform limitations, as with all other iOS web browsers. An optimized version of Firefox is also available on the Amazon Fire TV, as one of the two main browsers available with Amazon's Silk Browser.

Firefox was created in 2002 under the codename "Phoenix" by the Mozilla community members who desired a standalone browser, rather than the Mozilla Application Suite bundle. During its beta phase, Firefox proved to be popular with its testers and was praised for its speed, security, and add-ons compared to Microsoft's then-dominant Internet Explorer 6. Firefox was released on November 9, 2004, and challenged Internet Explorer's dominance with 60 million downloads within nine months. Firefox is the spiritual successor of Netscape Navigator, as the Mozilla community was created by Netscape in 1998 before their acquisition by AOL.

Firefox usage grew to a peak of 32.21% at the end of 2009, with version 3.5 overtaking Internet Explorer 7, although not all versions of Internet Explorer as a whole. Usage then declined in competition with Google Chrome. As of September 2020, Firefox has 8.34% usage share as a "desktop" browser, according to StatCounter, making it the second-most popular browser after Google Chrome with 69.87%; usage share across all platforms is lower at 4.09% (third-most popular overall after Safari). According to Mozilla, in December 2014, there were half a billion Firefox users around the world. Although all countries except for two have Google Chrome as their mainly used (desktop) web browser, the exceptions are in Cuba where Firefox still has over 50% desktop usage, and in Eritrea (most used at 40.87%). Firefox also has over 40% usage in Armenia, and over 20% usage in Germany, Austria, Poland, Luxembourg, Iran, Myanmar, East Timor, Burkina Faso, Madagascar, Cameroon, Ethiopia, Mali, Togo and Uganda.

| frequently updated     = yes
| programming language   = [[C (programming language)|C]]/[[C++]],{{Cite web |url= |title=Languages summary |}} [[JavaScript]], [[Cascading Style Sheets]], [[XUL]], [[XBL]]
| operating system       = [[Windows]], [[OS X]], [[Linux]], [[Android (operating system)|Android]],{{cite web |url= |title=Supported build configurations |accessdate=April 16, 2013 |author=Mozilla Developer Center contributors |date=March 4, 2013 |publisher=Mozilla Developer Network}} [[Firefox OS]], [[FreeBSD]],[ FreeBSD port of Firefox] [[NetBSD]],[ NetBSD binary package of Firefox 24] [[OpenBSD]], [[OpenIndiana]][ Source package of Firefox 3.6.15]
| engine                 = [[Gecko (layout engine)|Gecko]]
| size                   = 22 [[Megabyte|MB]]: Windows{{cite web|url= |title=History of FireFox distribution size | |date=March 23, 2013 |accessdate=July 1, 2013}}
44 MB: OS X
27-28 MB: Linux
22 MB: Android{{cite web | url = | title = Firefox for Android on Google Play | accessdate = November 19, 2012 }}
510 MB: source code{{cite web | url = | title = Latest stable Firefox release | publisher = Mozilla | date = May 11, 2013 | accessdate = May 29, 2013 }} | language count = 79 | language footnote = | status = Active | genre = [[Web browser]]
[[Feed reader]]
[[mobile web browser]] | license = [[Mozilla Public License|MPL]] | website = {{URL|}} | standard = [[HTML5]], [[CSS3]], [[RSS]], [[Atom (standard)|Atom]] | AsOf = }}

Mozilla Firefox is a free and open-source<ref name=“lwn_trademark”>

</ref> 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.<ref>


, Firefox has between 16% and 21% of worldwide usage, making it the third most popular web browser, according to different sources.<ref name=“w3counter1”>


</ref><ref name=“”>

</ref><ref name=“getclicky1”>

</ref> According to Mozilla, Firefox counts over 450 million users around the world.<ref name=“At a Glance”>

</ref> The browser has had particular success in Indonesia, Germany, Poland, and Iran, where it is the most popular browser with 57%,<ref name=“statcounterindonesia”>

</ref> 45%,<ref>

</ref> 44%,<ref>

</ref> and 43%<ref name=“statcounterindonesia”>

</ref> 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.<ref>

</ref> 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.<ref>


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.<ref>


</ref> 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,<ref>

</ref> often referred to as simply Firefox. Mozilla prefers that Firefox be abbreviated as Fx or fx, though it is often abbreviated as FF.<ref>

</ref> 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<ref name=“mozgeo”>

(section “What information is being sent, and to whom? (…)”)</ref> and an integrated search system that uses Google by default in most localizations. Functions can be added through extensions, created by third-party developers,<ref name=“mozilla1”>

</ref> 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.


test on Firefox 17.]] Firefox implements many web standards, including HTML4 (partial HTML5), XML, XHTML, MathML, SVG 1.1 (partial),<ref>

</ref> CSS (with extensions),<ref>

</ref> ECMAScript (JavaScript), DOM, XSLT, XPath, and APNG (Animated PNG) images with alpha transparency.<ref>

</ref> Firefox also implements standards proposals created by the WHATWG such as client-side storage,<ref>


</ref> and canvas element.<ref>


Firefox has passed the Acid2 standards-compliance test since version 3.0.<ref>

</ref> 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.<ref>

</ref> Because the SVG font tests were removed from the Acid3 test in September 2011, Firefox 4 and greater scored 100/100.<ref>

</ref><ref name=acid3updated>


Firefox also implements<ref name=“mozcomphishff3”>

(section “How does Phishing and Malware Protection work in Firefox?”)</ref> a proprietary protocol<ref name=“googsb2prot”>

“(…) Do not use this protocol without explicit written permission from Google., Note: This is not a license to use the defined protocol. (…)”</ref> from Google called “Safe Browsing”, used to exchange data related with phishing and malware protection.


Firefox uses a sandbox security model,<ref>

</ref> and limits scripts from accessing data from other web sites based on the same-origin policy.<ref>

</ref> It uses SSL/TLS to protect communications with web servers using strong cryptography when using the HTTPS protocol.<ref>

</ref> It also provides support for web applications to use smartcards for authentication purposes.<ref>Developer documentation on using PKCS#11 modules (primarily smart cards) for cryptographic purposes</ref>

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.<ref>

</ref> Official guidelines for handling security vulnerabilities discourage early disclosure of vulnerabilities so as not to give potential attackers an advantage in creating exploits.<ref>


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.<ref name=“WSJHowTo”>




</ref> 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.<ref>


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.<ref>

</ref> Symantec later clarified their statement, saying that Firefox still had fewer security vulnerabilities than Internet Explorer, as counted by security researchers.<ref>


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.<ref>


InfoWorld has cited security experts saying that as Firefox becomes more popular, more vulnerabilities will be found,<ref>

</ref> 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.”<ref name=“popularity-insecure”>


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.<ref>

</ref> This vulnerability has since been patched by Microsoft.<ref>


As of February 11, 2011, Firefox 3.6 had no known unpatched security vulnerabilities according to Secunia.<ref>

</ref> Internet Explorer 8 had five unpatched security vulnerabilities, the worst being rated “Less Critical” by Secunia.<ref>


Mozilla claims that all patched vulnerabilities of Mozilla products are publicly listed.<ref>Known Vulnerabilities in Mozilla Products Mozilla</ref>

On January 28, 2013, Mozilla was recognized as the most trusted internet company for privacy in 2012.<ref> Mozilla Recognized as Most Trusted Internet Company for Privacy</ref> 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.<ref name=pcmag-tpcookies>

</ref><ref name=cw-cookieblocking>


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).<ref name=ff23-relnotes>

</ref> Users can disable JavaScript via about:config or by extensions such as NoScript, and from Firefox 24, via developer tools.<ref>

</ref> 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”).<ref name=ff-bug-873709>



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,<ref>

</ref> these statistics are stored only in aggregate format, and the only personally identifiable information transmitted is the user's IP address.


.]] 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.<ref>

</ref> The currently supported 24.3.0esr and 27.0 versions are available in 89 locales (79 languages).<ref name=languages>


Platform availability

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.<ref name=“mozandroid-devices”>

</ref><ref name=engadget-firefoxmetro>

</ref> <gallery widths=200 heights=200 style=“text-align:center”> Firefox 24.0 on Ubuntu.png|Firefox 24 running on Ubuntu 13.04 Firefox 23.0.1 on OS X.png|Firefox 23 on OS X Mountain Lion Firefox Aurora 26 Windows 8 Metro.png|Firefox Aurora 26 modern UI version on Windows 8 Firefox for Android 14.0.png|Firefox for mobile 14 on Android </gallery> Firefox has also been ported to SkyOS, and an unofficial rebranded version called Timberwolf has been available for AmigaOS 4.


(identifiable by its connection failure message)]] Mozilla provides development builds of Firefox in the following channels: “Beta”, “Aurora”, and “Nightly”.

, 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.<ref name = “platform support” />

Firefox for mobile


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.<ref>

</ref> Version 4 for Android and Maemo was released on March 29, 2011.<ref name=“ff4”>

</ref> 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.<ref>

</ref> Version 7 was the last release for Maemo on the N900.<ref>

</ref> 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.<ref>


Extended Support Release


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.<ref name=“mozilla-esr-faq”>

</ref> 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.<ref>

</ref> 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

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

Recommended hardware and required software<ref name=“OfficialSysReqsMin”>


Windows Linux <small>desktop</small> OS X Android<ref name = “mobile_req”/>
CPU Pentium 4 or newer with SSE2 Any Intel CPU ARMv7 CPU<br/><small>(ARMv6 also works<ref>


Memory (RAM) 512 MB 384 MB
Hard disk drive free space 200 MB 24 MB
Operating system version XP SP2 <small>(desktop)</small><br /> Server 2003 SP1 <small>(server)</small><br />or newer Kernel 2.2.14 or newer with:<small>

  • GTK+ 2.18 or newer
  • GLib 2.22 or newer
  • Pango 1.14 or newer
  • X.Org 1.0 or newer<br/>(1.7 or newer recommended)
  • libstdc++ 4.3 or newer</small>

| OS X 10.6 or newer

2.2 or newer<ref name=“mobile_req”>


Display size (on mobile) must be at least 320 pixels high and 240 pixels wide.<ref name=“mobile_req”/>

OS support history

Operating system Latest stable version Support status
Microsoft Windows XP SP2/SP3 / 2003 SP1/SP2/R2 / Vista /<br/>2008 / 7 / 2008R2 / 8 / 2012

<ref name=“sysreq”/>

2000 / XP RTM/SP1 / 2003 RTM


</ref> and 12.0

NT 4 / 98 / ME


OS X 10.610.9

<ref name=“sysreq”/>

10.5 (Intel)

and 16.0.2<ref>


10.410.5 (PPC)






Linux Desktop kernel 2.2.14 and newer

<br/>(with some libraries<ref name=“sysreq”>


<ref name=“sysreq”/>


Firefox OS



  • FreeBSD provides a regularly updated port<ref name=FreeBSD /> of Firefox.
  • Firefox 3.5.9 is the last version to work on HP-UX 11i, as packaged by Hewlett-Packard.<ref>


  • Firefox 2.0 has been ported to

    (i.e. not supported by Mozilla).<ref>





CPU architecture

Native 64-bit builds are officially supported on Linux and OS X, but not on Windows:<ref name = “platform support” />

Operating system 32-bit support 64-bit support





<ref name=“win64build”>


Notes: :

Linux: Mozilla made Firefox for 64-bit Linux a priority with the release of Firefox 4, labeling it as tier 1 priority.<ref name = “platform support” /><ref>

</ref> Since being labeled tier 1, Mozilla has been providing official 64-bit releases for its browser for Linux.<ref>


</ref> 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&nbsp;4.<ref>





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.<ref>



Windows: The 32-bit and 64-bit versions of Windows Vista and Windows 7 can be used to run 32-bit Firefox.<ref name=“OfficialSysReqsMin” /> Mozilla does not currently support Win64 because many plug-ins do not yet support Win64 and other issues.<ref name=“platform support” /> Mozilla provides 64-bit versions for their Firefox nightly builds, however, the builds are not considered stable by Mozilla.<ref>


</ref> In late 2012, Mozilla announced 64-bit Windows builds would be stopped<ref name=“win64build” /> but later reversed the decision.<ref>



Firefox source code is free software, with most of it being released under the Mozilla Public License (MPL).<ref name=Licensing-Policies>

</ref> 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. <!– Miro and Songbird should somehow be separated because they build on XULRunner and not Firefox itself. –>

In the past, Firefox was licensed solely under the MPL, then version 1.1,<ref name=“mozrelicensing”>

</ref> 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.<ref>


</ref> 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.<ref name=“mozrelicensing”/> However, on January 3, 2012, Mozilla released the GPL-compatible MPL 2.0,<ref>

</ref> and with the release of Firefox 13 on June 5, 2012, Mozilla used it to replace the tri-licensing scheme.<ref>


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.<ref>

</ref> The name “Firefox” derives from a nickname of the red panda.<ref>


Mozilla has placed the Firefox logo files under open-source licenses,<ref>


</ref> but its trademark guidelines do not allow displaying altered<ref name=“MozComLegalStuff”>

</ref> or similar logos<ref name=“MozComStopLogo”>

Don't Create new elements that look enough like the Firefox logo so as to cause confusion.”</ref> in contexts where trademark law applies.

File:Iceweasel icon.svg

There has been some controversy over the Mozilla Foundation's intentions in stopping certain open source distributions from using the “Firefox” trademark.<ref name=“lwn_trademark”/> 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”.<ref>


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.<ref>

</ref> <!– is this important enough to include in the context of this article? - Some Debian developers had misunderstood previous communication to be an agreement that allowed them to do this, but Mozilla disputed this assertion. –> Ultimately, Debian switched to branding their modified version of Firefox “Iceweasel”, along with other Mozilla software.

Branding and visual identity

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.<ref name=“branding-mozilla”>

</ref> 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?”

File:Deer park globe.svg

, and is explicitly not protected as a trademark<ref>Mozilla Trademark Policy FAQ “What are the Mozilla Trademarks and Logos?”. Retrieved November 2, 2006</ref>]]

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.<ref name=“branding-mozilla-followup”>

</ref><ref name=“branding-firefox”>

</ref> The logo was later revised and updated, fixing several flaws found when it was enlarged.<ref name=“spot-the-difference”>


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.<ref name=“branding-firefox” /> 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.<ref>Mozilla Trademark Policy for Distribution Partners Version 0.9 (DRAFT). Retrieved November 2, 2006.</ref> For this reason, Debian and other software distributors who distribute patched or modified versions of Firefox do not use the icon.

Logo history: <gallery> File:Firefox-logo.svg|Logo used for Firefox 1.0 – 3.0 from November 9, 2004 to June 29, 2009 File:Mozilla Firefox 3.5 logo 256.png|Logo used for Firefox 3.5 – 22.0 from June 30, 2009 to August 5, 2013 File:Mozilla Firefox logo 2013.svg|Logo used for Firefox 23 and after since August 6, 2013<ref>

</ref> </gallery>

Other logos are also used for specific versions of the software: <gallery> File:Mozilla Phoenix Logo.png|Logo of “Phoenix” and “Firebird” before being renamed as Firefox File:Mozilla Aurora icon.png|The Aurora logo, used to represent an alpha release File:Mozilla Nightly icon 2011.png|The Nightly logo, used to represent nightly builds of pre-alpha versions File:Minefield-icon.png|Minefield logo (former name for “nightly” Firefox) </gallery>


The rapid adoption of Firefox, 100 million downloads in its first year of availability,<ref>

</ref> followed a series of aggressive marketing campaigns starting in 2004 with a series of events Blake Ross and Asa Dotzler called “marketing weeks”.<ref>


On September 12, 2004,<ref>

</ref> 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.<ref name=“Mozilla Foundation”>

</ref> 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.<ref name=“WorldRecord”>

</ref> This resulted in an official certified Guinness world record, with over eight million downloads.<ref>


The “World Firefox Day” campaign started on July 15, 2006,<ref>

</ref> the third anniversary of the founding of the Mozilla Foundation,<ref>

</ref> and ran until September 15, 2006.<ref>

</ref> 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.<ref>


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.<ref>


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.<ref>


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.”<ref>



In December 2005, Internet Week ran an article in which many readers reported high memory usage in Firefox 1.5.<ref>

</ref> 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.<ref>

</ref> Other known causes of memory problems were malfunctioning extensions such as Google Toolbar and some older versions of AdBlock,<ref>

</ref> or plug-ins, such as older versions of Adobe Acrobat Reader.<ref>

</ref> 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.<ref>


Softpedia noted that Firefox 1.5 took longer to start up than other browsers,<ref>

</ref> which was confirmed by further speed tests.<ref name=“speedcmp”>

</ref> 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.<!–<ref name=“speedcmp”/>–> As a workaround for the issue, a preloader application was created that loaded components of Firefox on startup, similar to Internet Explorer.<ref>

</ref> 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.<ref name=“pcworldreview”>


</ref> 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.<ref>



</ref> In mid-2009, Betanews benchmarked Firefox 3.5 and declared that it performed “nearly ten times better on XP than Microsoft Internet Explorer 7”.<ref name=“betanews”>


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.<ref>


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.<ref>


Market adoption



File:Usage share of web browsers (Source StatCounter).svg

according to StatCounter.]]

File:Browser Marketshares—November 2012—Firefox.svg

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.<ref>

</ref> This number does not include downloads using software updates or those from third-party websites.<ref>

</ref> 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

.<ref name=“At a Glance”/><ref>


In July 2010, all IBM employees (about 400,000) were asked to use Firefox as their default browser.<ref>


Firefox was the second-most used web browser until December 2011, when Google Chrome surpassed it.<ref>


, Firefox was the third most widely used browser, with approximately 25% of worldwide usage share of web browsers.<ref name=“w3counter1”/><ref name=“”/><ref name=“getclicky1”/> 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.<ref name=“”/>

Release history

Color Significance
Red Former release; no longer supported
Yellow Former release; still supported
Green Current supported release

See also



<ref name=“in JS”>


<ref name=“in CSS”>



Further reading

firefox.txt · Last modified: 2020/08/11 09:45 (external edit)