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{{About|a web browser|other uses|Firefox (disambiguation)}}{{Pp-move|small=yes}}{{short description|Free and open-source web browser by Mozilla}}{{Use mdy dates|date=May 2019}}

! Requirement! Microsoft Windows! Linux desktop! macOS! Android! iOS! CPU! Memory (RAM)! Data storage device free space! Operating system
name Firefox | title = Firefox| logo = Firefox Logo, 2017.svg| screenshot = Mozilla Firefox 65.png | caption = Firefox 65 (Quantum) running on Arch Linux with KDE Plasma 5

    TITLE=HAPPY BIRTHDAY, FIREFOX: THE LITTLE WEB BROWSER THAT COULD TURNS 10 FIRST=SCOTT WEBSITE=WIRED DF=MDY-ALL, | ver layout = stacked| repo =weblinkC++, JavaScript, HTML, C (programming language)>C, Rust (programming language)HTTPS://WWW.INFOWORLD.COM/ARTICLE/3165424/WEB-BROWSERS/MOZILLA-BINDS-FIREFOXS-FATE-TO-THE-RUST-LANGUAGE.HTMLLAST=YEGULALPDATE=FEBRUARY 3, 2017ACCESSDATE=AUGUST 19, 2017, }}| included with = Various Unix-like operating systemsGecko (software)>Gecko, Quantum, SpiderMonkey
    • Linux, IA-32: 62.8{{nbsp}}MBWEB,weblink Latest Firefox Linux installer, Mozilla, April 17, 2015,
    • Linux, x64: 61.1{{nbsp}}MBWEB,weblink Latest Firefox Linux 64-bit installer, Mozilla, April 17, 2015,
    • macOS: 66.9{{nbsp}}MBWEB,weblink Latest Firefox OS X installer, Mozilla, April 17, 2015,
    • Windows, IA-32: 44.4{{nbsp}}MBWEB,weblink Latest Firefox Windows installer, Mozilla, April 17, 2015,
    • Windows, x64: 45.9{{nbsp}}MBWEB,weblink Latest Firefox Windows 64-bit installer, Mozilla, April 17, 2015,
    }}| language count = 90| language footnote = | genre = Web browser
    Mozilla Public License>MPL 2.0HTTPS://WWW.MOZILLA.ORG/EN-US/ABOUT/LEGAL/EULA/>TITLE=MOZILLA, October 20, 2014, weblink}}| standard = HTML5, CSS3| AsOf = }}{{Firefox TOC}}Mozilla Firefox, or simply Firefox, is a free and open-sourceWEB,weblink Debian and Mozilla – a study in trademarks, January 10, 2005,,weblink August 1, 2017, September 14, 2011, web browser developed by the Mozilla Foundation and its subsidiary, Mozilla Corporation. 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. Its sibling, Firefox for Android, is also available. Firefox uses the Gecko layout engine to render web pages, which implements current and anticipated web standards.WEB, Gecko Layout Engine,, July 17, 2008,weblinkweblink" title="">weblink June 15, 2010, May 10, 2012, In 2017, Firefox began incorporating new technology under the code name Quantum to promote parallelism and a more intuitive user interface.WEB,weblink Introducing the New Firefox: Firefox Quantum, Mayo, Mark, November 14, 2017, The Mozilla Blog,weblink June 27, 2018, May 26, 2018, An additional version, Firefox for iOS, was released on November 12, 2015. Due to platform restrictions, it uses the WebKit layout engine instead of Gecko, as with all other iOS web browsers.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,WEB,weblink Firefox browser takes on Microsoft, November 9, 2004, BBC News,weblink" title="">weblink December 20, 2017, and challenged Internet Explorer's dominance with 60 million downloads within nine months.WEB,weblink The assault on software giant Microsoft, Weber, Tim, May 9, 2005, BBC News,weblink" title="">weblink September 25, 2017, Firefox is the spiritual successor of Netscape Navigator, as the Mozilla community was created by Netscape in 1998 before their acquisition by AOL.NEWS,weblink Curtains for Netscape – Tech Bytes, Jay, Paul, February 28, 2008, CBC News, Firefox usage grew to a peak of 32.21% at the end of 2009,WEB,weblink StatCounter Global Stats – Browser, OS, Search Engine including Mobile Usage Share, StatCounter,, September 16, 2016, with version 3.5 overtaking Internet Explorer 7, although not all versions of Internet Explorer as a whole.WEB,weblink StatCounter Global Stats - Browser, OS, Search Engine including Mobile Usage Share, StatCounter Global Stats, July 14, 2018, WEB,weblink StatCounter global stats – Top 12 browser versions, StatCounter, March 12, 2010, Usage then declined in competition with Google Chrome. {{As of|2019|10}}, Firefox has 9.54% usage share as a "desktop" browser, according to StatCounter, making it the second-most popular browser against Google Chrome with 69.08% (while share is exceptionally high in some countries where Firefox is most popular; up to over 75% share);WEB,weblink Desktop Browser Market Share Worldwide, StatCounter Global Stats, October 13, 2019, usage share across all platforms is lower at 4.44% (third-most popular overall).WEB,weblink Browser Market Share Worldwide, StatCounter Global Stats, September 6, 2019, According to Mozilla, in December 2014, there were half a billion Firefox users around the world.WEB,weblink At a Glance, Mozilla Press Center, Mozilla, December 7, 2014, __TOC__


    {{See also|Firefox version history}}The 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.WEB, Goodger, Ben, Ben Goodger, Where Did Firefox Come From?, Inside Firefox, MozillaZine Weblogs, February 6, 2006,weblinkweblink" title="">weblink June 23, 2011, January 7, 2012, 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.BOOK, Yeow, Cheah Chu, 2005, Firefox Secrets,weblink SitePoint Pty Ltd, 978-0-9752402-4-3, On April 3, 2003, the Mozilla Organization announced that they planned to change their focus from the Mozilla Suite to Firefox and Thunderbird.WEB,weblink mozilla development roadmap, Eich, Brendan, Brendan Eich, Hyatt, David, Dave Hyatt, April 2, 2003, Mozilla, August 2, 2009, The community-driven SeaMonkey was formed and eventually replaced the Mozilla Application Suite in 2005.File:Phoenix 0.1.png|thumb|left|Screenshot of Phoenix 0.1 on Windows XPWindows XPThe Firefox project has undergone several name changes.WEB,weblink Phoenix 0.1 (Pescadero) release Notes and FAQ, May 28, 2003,, February 26, 2018,weblink" title="">weblink May 28, 2003, WEB,weblink Phoenix 0.2 (Santa Cruz) release Notes and FAQ, December 3, 2003,, February 26, 2018,weblink" title="">weblink December 4, 2003, WEB,weblink Phoenix 0.3 (Lucia) release Notes and FAQ, December 3, 2003,, February 26, 2018,weblink" title="">weblink December 4, 2003, WEB,weblink Phoenix 0.4 (Oceano) Release Notes and FAQ, December 3, 2003,, February 26, 2018,weblink" title="">weblink December 3, 2003, WEB,weblink Phoenix 0.5 (Naples) Release Notes and FAQ, December 3, 2003,, February 26, 2018,weblink" title="">weblink December 3, 2003, WEB,weblink Mozilla Firebird 0.6 Release Notes and FAQ, December 3, 2003,, February 26, 2018,weblink" title="">weblink December 3, 2003, WEB,weblink Mozilla Firebird 0.6.1 Release Notes and FAQ, December 3, 2003,, February 26, 2018,weblink" title="">weblink December 3, 2003, WEB,weblink Mozilla Firebird 0.7 Release Notes, October 28, 2003,, February 26, 2018,weblink" title="">weblink October 28, 2003, The nascent browser was originally named Phoenix, after the mythical bird that rose triumphantly from the ashes of its dead predecessor (in this case, from the "ashes" of Netscape Navigator, after it was sidelined by Microsoft Internet Explorer in the "First Browser War"). Phoenix was renamed due to a trademark claim from Phoenix Technologies. The replacement name, Firebird, provoked an intense response from the Firebird database software project.WEB, Mozilla browser becomes Firebird, IBPhoenix,weblink January 30, 2007,weblink" title="">weblink September 14, 2007, NEWS,weblink Mozilla's Firebird gets wings clipped, Festa, Paul, May 7, 2003, live,weblink June 29, 2018, CNET, January 30, 2007, The Mozilla Foundation reassured them that the browser would always bear the name Mozilla Firebird to avoid confusion. After further pressure, Mozilla Firebird became Mozilla Firefox on February 9, 2004.NEWS,weblink Mozilla holds 'fire' in naming fight, Festa, Paul, February 9, 2004, live,weblink June 29, 2018, CNET, January 24, 2007, The name Firefox was said to be derived from a nickname of the red panda,WEB, Red panda,weblinkweblink" title="">weblink January 11, 2014, BBC Nature, August 20, 2014, which became the mascot for the newly named project.WEB, Firefox name FAQ, Garrity, Steven, Markham, Gervase, Goodger, Ben, Decrem, Bart, etal,,weblinkweblink" title="">weblink February 28, 2012, March 13, 2012, The Firefox project went through many versions before version 1.0 was released on November 9, 2004.WEB,weblink Firefox 1.0 Release Notes, November 9, 2004, archive, June 26, 2018, For the abbreviation of Firefox, Mozilla prefers Fx or fx, though it is often abbreviated as FF.WEB, Firefox 1.5 Release Notes,weblink November 29, 2005, archive, November 17, 2014, In 2016, Mozilla announced a project known as Quantum, which sought to improve Firefox's Gecko engine and other components to improve Firefox's performance, modernize its architecture, and transition the browser to a multi-process model. These improvements came in the wake of decreasing market share to Google Chrome, as well as concerns that its performance was lapsing in comparison. Despite its improvements, these changes required existing add-ons for Firefox to be made incompatible with newer versions, in favor of a new extension system that is designed to be similar to Chrome and other recent browsers. Firefox 57, which was released in November 2017, was the first version to contain enhancements from Quantum, and has thus been named Firefox Quantum. A Mozilla executive stated that Quantum was the "biggest update" to the browser since version 1.0.NEWS,weblink Inside Mozilla: Firefox fights back, Shankland, Stephen, August 4, 2017, CNET, October 9, 2017, CBS Interactive, NEWS,weblink Why you should root for Mozilla's Firefox 57 in the browser wars, Dignan, Larry, August 6, 2017, ZDNet, October 9, 2017,weblink December 11, 2017, live, NEWS,weblink Mozilla seeks return to glory with release of Firefox Quantum, Keizer, Gregg, November 14, 2017, Computerworld, December 11, 2017,weblink December 23, 2017, live, International Data Group, On May 3, 2019, the expiration of an intermediate signing certificate caused Firefox to automatically disable all browser extensions (add-ons).WEB,weblink Update Regarding Add-ons in Firefox, Mozilla, May 4, 2019, May 4, 2019, Needham, Kev, NEWS, Brinkmann, Martin, Your Firefox extensions are all disabled? That's a bug!, GHacks, May 4, 2019,weblink May 4, 2019, Mozilla began roll-out of a fix shortly thereafter, using their Mozilla Studies component.


    Features include tabbed browsing, spell checking, incremental search, live bookmarking, Smart Bookmarks, a download manager, private browsing, location-aware browsing (also known as "geolocation") based on a Google service,WEB, Location-Aware Browsing,weblink July 5, 2009, Mozilla Foundation, (section "What information is being sent, and to whom? (...)") and an integrated search system, which uses Google by default in most markets.WEB,weblink Mozilla terminates its deal with Yahoo and makes Google the default in Firefox again, Lardinois, Frederic, November 14, 2017, TechCrunch, November 14, 2017, 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 and more recently there has been an integration feature with Pocket. Firefox Hello was an implementation of WebRTC, added in October 2014, which allows users of Firefox and other compatible systems to have a video call, with the extra feature of screen and file sharing by sending a link to each other. Firefox Hello was scheduled to be removed in September 2016.WEB,weblink Hang up the phone: Mozilla to pull the plug on Firefox Hello in September, Parrish, Kevin, August 5, 2016, Digital Trends,weblink January 15, 2017, live, Functions can be added through add-ons created by third-party developers. Add-ons are primarily coded using an HTML and JavaScript API known as WebExtensions, which is designed to be similar to the Google Chrome and Microsoft Edge extension systems. Firefox previously supported add-ons using the XUL and XPCOM APIs, which allowed them to directly access and manipulate much of the browser's internal functionality. As they are not compatible with its multi-process architecture, XUL add-ons are now deemed Legacy add-ons and are no longer supported on Firefox 57 and newer.WEB,weblink Upcoming Changes in Compatibility Features, Villalobos, Jorge, August 10, 2017, Mozilla Add-ons Blog, December 11, 2017, NEWS,weblink Mozilla sets plan to dump Firefox add-ons, move to Chrome-like extensions, Bright, Peter, August 21, 2015, Ars Technica, December 11, 2017, Firefox can have themes added to it, which users can create or download from third parties to change the appearance of the browser. The Firefox add-on website also gives users the ability to add other applications such as games, ad-blockers, screenshot apps, and many other apps.WEB, Mozilla sets plan to dump Firefox add-ons, move to Chrome-like extensions,weblink Ars Technica, August 22, 2015, August 21, 2015, WEB, Social & Communication: Add-ons for Firefox,weblink, November 16, 2015,


    File:Acid3 Mozilla Firefox test.png|thumb|The result of the Acid3Acid3Firefox implements many web standards, including HTML4 (almost full HTML5), XML, XHTML, MathML, SVG 2 (partial),WEB,weblink SVG 2 support in Mozilla, WEB,weblink September 30, 2007, SVG in Firefox, CSS (with extensions),WEB,weblink CSS Reference: Mozilla Extensions – MDC,, April 24, 2011, August 17, 2011, ECMAScript (JavaScript), DOM, XSLT, XPath, and APNG (Animated PNG) images with alpha transparency.WEB,weblink Which open standards is the Gecko development project working to support, and to what extent does it support them?, Gecko FAQ, January 24, 2007, Mozilla Developer Center contributors, January 21, 2007, Mozilla Developer Network, Firefox also implements standards proposals created by the WHATWG such as client-side storage,WEB,weblink WHATWG specification â€“ Web Applications 1.0 â€“ Working Draft. Client-side session and persistent storage, February 7, 2007, February 7, 2007, Web Hypertext Application Technology Working Group, WEB,weblink DOM:Storage, February 7, 2007, Mozilla Developer Center contributors, September 30, 2007, Mozilla Developer Network, and canvas element.WEB,weblink The future of HTML, Part 1: WHATWG, Dumbill, Edd, December 6, 2005, IBM, January 24, 2007, These standards are implemented through the Gecko layout engine, and SpiderMonkey JavaScript engine.Firefox has passed the Acid2 standards-compliance test since version 3.0.WEB,weblink Latest Firefox beta passes Acid2 test, IE8 claims to pass also, Fulton, Scott M., December 20, 2007, BetaNews,weblink June 28, 2018, live, December 21, 2007, 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.WEB,weblink Why Firefox 4 Will Never Pass The Acid3 Test, Bailey, Daniel,weblink" title="">weblink February 3, 2011, February 1, 2011, Because the SVG font tests were removed from the Acid3 test in September 2011, Firefox 4 and greater scored 100/100.WEB,weblink Acid3 2011 Update, Hickson, Ian, September 17, 2011, September 17, 2011, WEB,weblink Acid3 Test Simplified; All Modern Browsers Score 100, Perry, Douglas, September 20, 2011, Tom's Guide, Purch Group, Firefox also implements "Safe Browsing",WEB, Phishing and Malware Protection,weblink November 29, 2009, Mozilla Corp., How does Phishing and Malware Protection work in Firefox?, a proprietary protocolWEB, Client specification for the Google Safe Browsing v2.1 protocol,weblink November 29, 2009, Google Inc., Do not use this protocol without explicit written permission from Google. Note: This is not a license to use the defined protocol. [...], from Google used to exchange data related with phishing and malware protection.Since version 38 on Windows Vista and newer, Firefox supports the playback of video content protected by HTML5 Encrypted Media Extensions (EME). For security and privacy reasons,{{Which|date=April 2017}} EME is implemented within a wrapper of open source code that allows execution of a proprietary DRM module by Adobe Systems—Adobe Primetime Content Decryption Module (CDM). CDM runs within a "sandbox" environment to limit its access to the system, and provide it a randomized device ID to prevent services from uniquely identifying the device for tracking purposes. The DRM module, once it has been downloaded, is enabled and disabled in the same manner as other plug-ins. Since version 47,WEB,weblink Firefox — Notes (47.0), "Google's Widevine CDM on Windows and Mac OS X so streaming services like Amazon Video can switch from Silverlight to encrypted HTML5 video" is also supported. Mozilla justified its partnership with Adobe and Google by stating}}and that it is "an important step on Mozilla's roadmap to remove NPAPI plugin support."WEB,weblink Mozilla To Test Widevine CDM in Firefox Nightly, April 8, 2016, Upon the introduction of EME support, builds of Firefox on Windows were also introduced that exclude support for EME.WEB,weblink Mozilla hates it, but streaming video DRM is coming to Firefox, Kirk, Jeremy, May 15, 2014, PC World, WEB,weblink Firefox 38 arrives with contentious closed-source DRM integrated by default, Paul, Ian, May 13, 2015, PC World, August 12, 2015, The Free Software Foundation and Cory Doctorow condemned Mozilla's decision to support EME.WEB,weblink Mixed reactions greet Mozilla plans to add HTML5 DRM in Firefox, James, Chesters, InfoQ, May 20, 2014, May 6, 2019, On the HTML5 web standards test, Firefox 69 scores 528 out of 582 pointsWEB,weblink HTML5test - How well does your browser support HTML5?,, October 13, 2019, (70.0 beta has 531 points).


    {{See also|Browser security}}Firefox allowed for a sandbox security model to manage privileges accorded to JavaScript code, but that feature has since been deprecated.WEB,weblink Bypassing Security Restrictions and Signing Code, January 24, 2007, Ranganathan, Arun, Netscape Communications, November 11, 2002, Mozilla Developer Network, It limits scripts from accessing data from other websites based on the same-origin policy.WEB,weblink The Same Origin Policy, June 8, 2001, November 12, 2007, Mozilla Developer Network, It also provides support for smart cards to web applications, for authentication purposes.Developer documentation on using PKCS 11 modules (primarily smart cards) for cryptographic purposes It uses TLS to protect communications with web servers using strong cryptography when using the HTTPS protocol.WEB,weblink Privacy & Security Preferences â€“ SSL, January 24, 2007, August 31, 2001, Mozilla, The freely available HTTPS Everywhere add-on enforces HTTPS, even if a regular HTTP URL is entered. Firefox now supports HTTP/2."Why You Should Use Firefox: 7 Reasons", eCloudBuzz, March 15, 2015.The Mozilla Foundation offers a "bug bounty" (US$3,000 to US$7,500 cash reward) to researchers who discover severe security holes in Firefox.WEB,weblink Mozilla Security Bug Bounty Program, July 20, 2016, Mozilla, Official guidelines for handling security vulnerabilities discourage early disclosure of vulnerabilities so as not to give potential attackers an advantage in creating exploits.WEB,weblink Handling Mozilla Security Bugs, January 24, 2007, February 11, 2003, Mozilla, Because Firefox generally has fewer publicly known 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.NEWS,weblinkweblink" title="">weblink February 21, 2007, How to Protect Yourself From Vandals, Viruses If You Use Windows, Mossberg, Walter S., The Wall Street Journal, September 16, 2004, October 17, 2006, I suggest dumping Microsoft's Internet Explorer Web browser, which has a history of security breaches. I recommend instead Mozilla Firefox, which is free at It's not only more secure but also more modern and advanced, with tabbed browsing, which allows multiple pages to be open on one screen, and a better pop-up ad blocker than the belated one Microsoft recently added to IE., WEB,weblink Time to Dump Internet Explorer, Granneman, Scott, June 17, 2004, SecurityFocus, January 24, 2007, NEWS, Costa, Dan, Scott, Vamosi, Mozilla Firefox {{sic, Browser, yes, review |publisher=CNET |date=March 24, 2005 |url= |archive-url= |archive-date=December 26, 2007}}NEWS,weblink Are the Browser Wars Back?, January 24, 2007, Boutin, Paul, June 30, 2004, Slate (magazine), Slate, The Washington Post reported that exploit code for known critical 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 nine days before Mozilla issued a patch to remedy the problem.NEWS, Krebs, Brian, Internet Explorer Unsafe for 284 Days in 2006, The Washington Post, January 4, 2007,weblink January 24, 2007,weblink January 17, 2010, 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, with Firefox's vulnerabilities being fixed on average one day after the exploit code was made available, as compared to nine days for Internet Explorer.NEWS,weblinkweblink" title="">weblink February 7, 2008, Firefox Sports More Bugs, But IE Takes 9 Times Longer To Patch, January 24, 2007, Keizer, Gregg, September 25, 2006, TechWeb, Symantec later clarified their statement, saying that Firefox still had fewer security vulnerabilities than Internet Explorer, as counted by security researchers.NEWS,weblink Symantec adjusts browser bug count, January 24, 2007, McMillan, Robert, March 7, 2006, InfoWorld, 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 fifth-most vulnerable desktop software, with Internet Explorer as the eighth, and Google Chrome as the first.NEWS,weblink Web Browsers, Desktop Software Top "Dirty Dozen" Apps List, November 17, 2010, January 2, 2013,, InfoWorld has cited security experts saying that, as Firefox becomes more popular, more vulnerabilities will be found,NEWS,weblink Security firms fight Firefox fire with fire, Francis, Bob, May 12, 2005, InfoWorld, 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," she said.WEB, Kanellos, Michael, Popularity won't make Firefox insecure, says Mozilla head,, March 23, 2005,weblinkweblink" title="">weblink May 21, 2011, October 13, 2006, In October 2009, Microsoft's security engineers acknowledged that Firefox was vulnerable to a security issue found in the 'Windows Presentation Foundation' browser plug-in since February of that year. A .NET Framework 3.5 SP1 Windows Update had silently installed the vulnerable plug-in into Firefox.WEB,weblink Sneaky Microsoft plug-in puts Firefox users at risk (Internet â€“ Software â€“ Security), Keizer, Gregg, October 16, 2009, IDG News, International Data Group, December 19, 2009, This vulnerability has since been patched by Microsoft.WEB,weblink Microsoft Security Bulletin MS09-054 - Critical, October 13, 2009, Microsoft,weblink March 18, 2010, March 17, 2010, {{As of|2011|February|11|df=US}}, Firefox 3.6 had no known unpatched security vulnerabilities according to Secunia.WEB,weblink Vulnerability Report: Mozilla Firefox 3.6.x, February 11, 2011, Secunia, Internet Explorer 8 had five unpatched security vulnerabilities, the worst being rated "Less Critical" by Secunia.WEB,weblink Vulnerability Report: Microsoft Internet Explorer 8.x, February 11, 2011, Secunia, Mozilla claims that all patched vulnerabilities of Mozilla products are publicly listed.WEB,weblink Known Vulnerabilities in Mozilla Products, Mozilla, On January 28, 2013, Mozilla was recognized as the most trusted internet company for privacy in 2012.WEB,weblink Mozilla Recognized as Most Trusted Internet Company for Privacy, Anderson, Harvey, January 28, 2013, The Mozilla Blog, Mozilla, This study was performed by the 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 was then delayed so Mozilla developers could "collect and analyze data on the effect of blocking some third-party cookies." Mozilla also collaborated with Stanford University's "Cookie Clearinghouse" project to develop a blacklist and whitelist of sites that will be used in the filter.NEWS,weblink Firefox 22 to Disable Third-Party Cookies by Default, Murphy, David, February 24, 2013, PC Magazine, September 21, 2013, NEWS,weblink Mozilla again postpones Firefox third-party cookie-blocking, this time for months, Keizer, Gregg, June 20, 2013, Computerworld, September 21, 2013, Version 23, released in August 2013, followed the lead of its competitors by blocking iframe, stylesheet, and script resources served from non-HTTPS servers embedded on HTTPS pages by default. Additionally, JavaScript could also no longer be disabled through Firefox's preferences, and JavaScript was automatically re-enabled for users who upgraded to 23 or higher with it disabled. The change was made due to its use across the majority of websites, the potential repercussions on non-experienced users who are unaware of its impact, along with the availability of extensions such as NoScript, which can disable JavaScript in a more controlled fashion. The following release added the ability to disable JavaScript through the developer tools for testing purposes.WEB,weblink Firefox 23 Release Notes, August 6, 2013,, March 14, 2014, NEWS,weblink Firefox 23 lands with a new logo and mixed content blocking, Bright, Peter, August 6, 2013, Ars Technica, March 14, 2014, NEWS,weblink Firefox 23 finally kills the blink tag, removes ability to turn off JavaScript, introduces new logo, Anthony, Sebastian, August 7, 2013, ExtremeTech, March 14, 2014, In January 2015, TorrentFreak reported that using Firefox when connected to the internet using a VPN can be a serious security issue due to the browser's support for WebRTC.Huge Security Flaw Leaks VPN Users' Real IP-addresses (January 30, 2015). Retrieved February 21, 2015.Beginning with Firefox 44, all extensions must be signed by Mozilla to be used in release and beta versions of Firefox. Firefox 43 blocked unsigned extensions, but allowed enforcement of extension signing to be disabled. All extensions must be submitted to Mozilla Add-ons and be subject to code analysis in order to be signed, although extensions do not have to be listed on the service in order to be signed.WEB, Addons/Extension Signing,weblink Mozilla wiki, September 24, 2015, WEB,weblink Introducing Extension Signing: A Safer Add-on Experience, Villalobos, Jorge, February 10, 2015, Mozilla Add-ons Blog, August 31, 2015, On May 2, 2019, Mozilla announced that it would be strengthening the signature enforcement with methods that included the retroactive disabling of old extensions now deemed to be insecure. A Firefox update on May 3 led to bug reports about all extensions being disabled. This was found to be the result of an overlooked certificate and not the policy change set to go into effect on June 10.WEB,weblink Firefox fixes borked extensions for everyone but legacy users, Victoria, Song, Gizmodo, May 6, 2019, May 6, 2019, In Firefox versions prior to 7.0, an information bar appears on the browser's first start asking users whether they would like to send performance statistics, or "telemetry", to Mozilla. It is enabled by default in development versions of Firefox, but not in release versions.WEB,weblink FAQ – Why is Telemetry enabled by default on the Firefox pre-release channels?, MozillaWiki, Mozilla, According to Mozilla's privacy policy,WEB,weblink Mozilla Firefox Privacy Policy, Mozilla Corporation, a subsidiary of the Mozilla Foundation, these statistics are stored only in aggregate format, and the only personally identifiable information transmitted is the user's IP address.In November 2018, Firefox began using a sandbox to isolate web tabs from each other and from the rest of the system. Its lack of such a feature had previously earned it negative comparisons with Google Chrome and Microsoft Edge.NEWS,weblink Firefox takes the next step toward rolling out multi-process to everyone, Bright, Peter, December 21, 2016, Ars Technica, December 25, 2016, WEB,weblink Security/Sandbox - MozillaWiki,, November 12, 2018, Since version 60 Firefox includes the option to use DNS over HTTPS (DoH), which causes DNS lookup requests to be sent encrypted over the HTTPS protocol. To use this feature the user must set certain preferences beginning with "network.trr" (Trusted Recursive Resolver) in (about:config): if network.trr.mode is 0, DoH is disabled; 1 activates DoH in addition to unencrypted DNS; 2 causes DoH to be used before unencrypted DNS; to use only DoH, the value must be 3. By setting network.trr.uri to the URLweblink{{Dead link|date=October 2019 |bot=InternetArchiveBot |fix-attempted=yes }} special Cloudflare servers will be activated.WEB,weblink Private Auskunft - DNS mit Privacy und Security vor dem Durchbruch, c't Magazin, July 25, 2018, de, Mozilla has a privacy agreement with this server host that restricts their collection of information about incoming DNS requests.WEB,weblink Cloudflare Resolver for Firefox,, July 25, 2018, On May 21, 2019, Firefox was updated to include the ability to block scripts that used a computer's CPU to mine cryptocurrency without a user's permission, in Firefox version 67.0. The update also allowed users to block known fingerprinting scripts that track their activity across the web, however it does not resist fingerprinting on its own.WEB, Wood, Marissa, Latest Firefox Release is Faster than Ever,weblink The Mozilla Blog, May 22, 2019, On July 2, 2019, Mozilla introduced a mechanism to allow Firefox to automatically trust OS-installed certificates to prevent TLS errors.WEB,weblink Firefox Update to Trusts OS-Installed Certificates to Prevent TLS Errors, July 2, 2019, Hack Hex, July 2, 2019,


    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 and Simplified Chinese characters.WEB,weblink Index of /pub/firefox/releases/1.0/win32/, August 22, 2011, {{As of|2019|10}}, currently supported versions 69.0.2, 68.1.0esr and 60.9.0esr are available in 89 locales (79 languages).WEB,weblink Mozilla Firefox release files, Mozilla, August 22, 2011,weblink August 21, 2015, dead,

    Platform availability

    The desktop version of Firefox is available and supported for Microsoft Windows, macOS and Linux, while Firefox for Android is available for Android (formerly Firefox for mobile, it also ran on Firefox OS).{{Firefox release compatibility}}Firefox source code may be compiled for various operating systems; however, officially distributed binaries are provided for the following:{| class="wikitable" style="text-align:center;"
    512 Megabyte for the 32-bit version and 2 Gigabyte>GB for the 64-bit version| 384 MB| ?
    200 MB| 50 MB| ?
    Windows 7 or laterWindows Server 2008 R2>Server 2008 R2 or later
    • GTK+ 3.4 or newerWEB,weblink Firefox — Aurora Notes (45.0a2), December 18, 2015,, Mozilla Foundation, February 29, 2016,
    • GLib 2.22 or newer
    • Pango 1.22 or newer
    • libstdc++ 4.6.1 or newer
    • X.Org 1.0 or newer


    Microsoft Windows

    Firefox 1.0 was released for Windows 9x, as well as Windows NT 4.0 and later. Some users reported the 1.x builds were operable (but not installable) on Windows NT 3.51.WEB,weblink Mozilla Firefox and Windows NT 3.51, Tilley, Chris, April 21, 2006, C:Amie, December 25, 2018, In September 2013, a Metro-style version of Firefox optimized for touchscreen use was introduced on the "Aurora" release channel. However, the project has since been cancelled {{as of|2014|March|lc=y}}, with Mozilla citing a lack of user adoption of the beta versions.WEB,weblink Update on Metro, Nightingale, Johnathan, March 14, 2014, Firefox Future Releases Blog, March 14, 2014, WEB,weblink Mozilla Firefox Web Browser – Supported Android Devices, Mozilla, July 20, 2013, NEWS,weblink Firefox for Windows 8 enters Aurora channel with touch and gesture support, Lutz, Zachary, September 21, 2013, Engadget, September 21, 2013, Version 43.0 included the first x64 builds, made for Windows 7 and Server 2008 R2.WEB,weblink Firefox 64-bit Web Browser for Windows Now Available, Mayo, Mark, December 15, 2015, Future Releases, Mozilla Foundation,, Version 49.0 dropped support for processors without the SSE2 instruction set on Windows.In April 2017, users of Firefox 52.0.2 on Windows XP, Windows Vista, Windows Server 2003 and Windows Server 2008 who had automatic updates enabled were migrated to Firefox 52 ESR. The support was projected to end for these operating systems with the last release in June 2018.WEB,weblink Update on Firefox Support for Windows XP and Vista, December 23, 2016, Future Releases, Mozilla Foundation,,


    The first official release (Firefox version 1.0) supported macOS (then called Mac OS X) on the PowerPC architecture. Mac OS X builds for the IA-32 architecture became available via a universal binary which debuted with Firefox in 2006.Starting with version 4.0, Firefox was released for the x64 architecture to which macOS had migrated.WEB,weblink Mozilla Developer Preview Alpha 5 Release Notes, Mozilla, June 14, 2010, July 10, 2011,weblink" title="">weblink June 29, 2011,


    Since its inception, Firefox for Linux supported the 32-bit memory architecture of the IA-32 instruction set. 64-bit builds were introduced in the 4.0 release. The 46.0 release replaced GTK+ 2.18 with 3.4 as a system requirement on Linux and other systems running X.Org.WEB,weblink Firefox 46.0 System Requirements, Mozilla, February 26, 2018, Starting with 53.0, the 32-bit builds require the SSE2 instruction set.

    Firefox for mobile

    Firefox for Android, codenamed Fennec, is a web browser for smaller non-PC devices, mobile phones, and PDAs. It was originally first released for the Nokia Maemo operating system, specifically the Nokia N900, on January 28, 2010.WEB,weblink Firefox for Nokia N900 Release Notes, Mozilla, January 28, 2010, January 30, 2010, On March 29, 2011, besides Maemo, Version 4 was added for Android.WEB, Mozilla Launches Firefox 4 for Android, Allowing Users to Take the Power and Customization of Firefox Everywhere, Mozilla Blog, Mozilla, March 29, 2011,weblink March 29, 2011, With the release of mobile version, the browser's version number was bumped from 2 to 4, synchronizing it with all future desktop releases of Firefox because the rendering engines used in both browsers are the same.WEB,weblink Fennec 4.0 – New and Notable, Finkle, Mark, September 30, 2010, Stark Raving Finkle, Version 7 was the last release for Maemo on the N900.WEB, Bug 681422: No updates in Maemo5 (Comment #1), Mozilla Bugzilla,weblink Mozilla, 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 Awesome Bar, 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.WEB, Firefox mobile features, Mozilla,weblink January 30, 2010, In April 2013, then-Mozilla CEO Gary Kovacs said that Firefox would not come to iOS as long as Apple required the use of the WebKit layout engine to do so. One reason given by Mozilla was that prior to iOS 8, Apple had supplied third-party browsers with an inferior version of their JavaScript engine which hobbled their performance, making it impossible to match Safari's JavaScript performance on the iOS platform.WEB,weblink Mozilla wants to bring Firefox to iOS, but mean ol' Apple's standing in its way, Bilton, Ricardo, March 10, 2013, VentureBeat, September 18, 2016, Apple later opened their "Nitro" JavaScript engine to third-party browsers.WEB,weblink iOS 8 grants new power to rival browsers, Web-based apps, Shankland, Stephen, June 4, 2014, CNET, September 18, 2016, In 2015, Mozilla announced it was moving forward with Firefox for iOS, with a preview release made available in New Zealand in September of that year.WEB,weblink Firefox for iOS Now Available for Preview, September 3, 2015, September 7, 2015, WEB,weblink Fruity Firefox: Mozilla caves to Apple, unveils iOS-friendly browser, Clarke, Gavin, September 4, 2015, September 7, 2015, WEB,weblink Update on Firefox for iOS, May 22, 2015, September 7, 2015, In November 2016, Firefox released a new iOS app titled Firefox Focus, a private web browser.WEB,weblink Mozilla launches Firefox Focus, a private web browser for iPhone, Perez, Sarah, November 17, 2016, TechCrunch, May 6, 2017, {{Fennec release compatibility}}

    Unofficial ports

    Firefox has also been ported to FreeBSD,WEB,weblink FreeBSD port of Firefox, September 30, 2014, NetBSD,NetBSD binary package of Firefox 24 {{Dead link|date=July 2019 |bot=InternetArchiveBot |fix-attempted=yes }} OpenBSD,WEB,weblink OpenBSD port of Firefox, OpenIndiana,Source package of Firefox 3.6.15 {{webarchive |url= |date=March 4, 2016 }}. OS/2,WEB,weblink [] Viewing file: /pub/os2/apps/internet/www/browser/firefox-38.8.0.en-us.os2-wpi.wpi,, October 18, 2016, SkyOS and BeOS/Haiku,WEB,weblink Bezilla: Mozilla for BeOS/ZETA, Firefox entry on BeBytesFirefox entry on BeBits {{Dead link|fix-attempted=yes|date=August 2019}}{{webarchive |url=|date=July 17, 2012}}Firefox Bleeding Edge entry on BeBits {{Dead link|fix-attempted=yes|date=August 2019}}{{webarchive |url=|date=April 15, 2012}} and an unofficial rebranded version called Timberwolf has been available for AmigaOS 4. An unofficial continuation of the Mac OS X PowerPC release continues as TenFourFox.The Firefox port for OpenBSD is maintained by Landry Breuil since 2010. Firefox is regularly built for the current branch of the operating system, the latest versions are packaged for each release and remain frozen until the next release. In 2017, Landry began hosting packages of newer Firefox versions for OpenBSD releases from 6.0 onwards, making them available to installations without the ports system.WEB,weblink OpenBSD Journal, December 18, 2017, April 25, 2017, The many ways of running firefox on OpenBSD, The Solaris port of Firefox (including OpenSolaris) was maintained by the Oracle Solaris Desktop Beijing Team,WEB,weblink Directory Listing: /pub/firefox/releases/52.0.2esr/contrib/,, February 14, 2018, WEB,weblink Mozilla – Firefox, Thunderbird & Sunbird, UNIX Packages, October 29, 2015, until March 2017 when the team was disbanded.WEB,weblink Oracle said to axe 200 Beijing jobs, Yuanyuan, Hu, Xiaojin, Ren, January 17, 2017, China Daily Information Co, February 14, 2018, There was also an unofficial port of Firefox 3.6.x to IBM AIXWEB,weblink IBM AIX: Web browsers for AIX,, October 29, 2015,weblink" title="">weblink January 5, 2016, WEB,weblink Mozilla on AIX FAQ,, October 29, 2015, and of v1.7.x to UnixWare.WEB,weblink README Mozilla, v. 1.7.13 for SCO(R) UnixWare(R) 7.1.3 SCO(R) UnixWare(R) 7.1.4,, June 6, 2005, October 29, 2015, {{Firefox contrib release compatibility}}


    File:Mozilla Firefox 68 Windows 10.png|Firefox 68 running on Windows 10File:Firefox 57 High Sierra.png|Firefox 57 on macOS High SierraFile:Firefox Developer Edition 70.0b3.png|Firefox Developer Edition 70.0b3 on Arch LinuxFile:Firefox Android 62.png|Firefox for Android 62 on AndroidFile:Firefox in firefox os.png|Firefox on Firefox OSFile:FennecMeeGo (cropped).png|Firefox on MeeGo OS

    Experimental builds and ESR

    Besides official releases, Mozilla provides development builds of Firefox in distribution channels named, in order of most to least stable, "Beta", "Developer Edition" (former "Aurora", renamed on November 10, 2014WEB,weblink Firefox – Aurora Notes (35.0a2) – Mozilla, November 10, 2014, November 21, 2014, Version 35.0a2, first offered to Firefox Developer Edition users in November 2014, WEB,weblink Bug 1072181 – Investigate tweaking aurora for developers, November 21, 2014, ), and "Nightly".WEB,weblink Firefox Channels, Mozilla, Starting from Firefox 54, "Developer Edition" is based on the "Beta" build.WEB,weblink Simplifying Firefox Release Channels and Improving Developer Edition's Stability, Spivak, Ali, Camp, Dave, April 17, 2017, Mozilla, Ledru, Sylvestre, Firefox ESR ({{vanchor|Extended Support Release}}) is a version of Firefox for organizations and other groups that need extended support for mass deployments. Each ESR release, based on the regular version released at the same time, is supported for approximately one year.WEB, Firefox Extended Release Support for Your Organization, Business, Enterprise – Overview,,weblink March 17, 2012, Unlike the regular ("rapid") releases, ESRs are not updated with new features and performance enhancements every six weeks, but rather are updated with only high-risk-reduction or high-impact security fixes or major stability fixes with point releases, until the end of the ESR cycle.NEWS, Paul, Ryan, Firefox extended support will mitigate rapid release challenges,, January 10, 2012,weblink April 4, 2012,


    Firefox source code is free software, with most of it being released under the Mozilla Public License (MPL) version 2.0.{{citation |url= |title=Mozilla Licensing Policies | |accessdate=January 5, 2012}} This license permits anyone to view, modify, or redistribute the source code. As a result, several publicly released applications have been built from it, such as Netscape, Flock, Miro, GNU IceCat, Iceweasel, Songbird, Pale Moon, and Comodo IceDragon.In the past, Firefox was licensed solely under the MPL, then version 1.1,WEB,weblink Mozilla Relicensing FAQ, January 24, 2007, Mozilla,weblink" title="">weblink May 13, 2010, which the Free Software Foundation criticized for being weak copyleft, as 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.WEB,weblink On the Netscape Public License, January 24, 2007, Stallman, Richard, Richard Stallman, Free Software Foundation, WEB,weblink Various Licenses and Comments about Them. Mozilla Public License (MPL), January 24, 2007, Free Software Foundation, 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. However, on January 3, 2012, Mozilla released the GPL-compatible MPL 2.0,WEB, Announcing Version 2.0 of the Mozilla Public License, Mozilla, January 3, 2012,weblink June 6, 2012,weblink" title="">weblink March 6, 2012, and with the release of Firefox 13 on June 5, 2012, Mozilla used it to replace the tri-licensing scheme.NEWS,weblink Firefox 13 released – now using SPDY by default, June 5, 2012, June 6, 2012, The H – Open, The crash reporting service was initially closed-source, but switched with version 3 from a program called Talkback to the open-source Breakpad (and Socorro server).

    Trademark and logo

    {{See also|Mozilla software rebranded by Debian}}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.WEB,weblink Mozilla Trademark Policy, January 30, 2007, Mozilla, The name "Firefox" derives from a nickname of the red panda.Mozilla has placed the Firefox logo files under open-source licenses,WEB,weblink LICENSE file for official branding directory, WEB, Mozilla bug 541761 – Some text implies the Firefox logo is under a non-free copyright license,weblink but its trademark guidelines do not allow displaying alteredWEB,weblink Legal Stuff, March 7, 2009, Mozilla Corp,weblink" title="">weblink July 30, 2013, or similar logosWEB, Stop Logo Cruelty, Mozilla Corp.,weblink March 7, 2009,weblink" title="">weblink May 22, 2010, "Don't Create new elements that look enough like the Firefox logo so as to cause confusion." in contexts where trademark law applies.File:Iceweasel icon.svg|thumb|upright|Logo used for IceweaselIceweaselThere has been some controversy over the Mozilla Foundation's intentions in stopping certain open source distributions from using the "Firefox" trademark. Open source browsers "enable greater choice and innovation in the market rather than aiming for mass-market domination." 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".NEWS, Dan, Warne, The stoush over Linux distributions using the Firefox trademark, APC Magazine, ACP Magazines Ltd, May 7, 2007,weblink January 18, 2008, To allow distributions of the code without using the official branding, the Firefox build system contains a "branding switch". This switch, often used for alphas ("Auroras") of future Firefox versions, allows the code to be compiled without the official logo and name, and can allow a derivative work unencumbered by restrictions on the Firefox trademark to be produced. In the unbranded build 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 required explicit approval from Mozilla for the changes made to the underlying code, and required the use of all of the official branding. For example, it was 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.WEB,weblink Debian Bug report logs – #354622: Uses Mozilla Firefox trademark without permission, Debian, January 30, 2007, Ultimately, Debian switched to branding their modified version of Firefox "Iceweasel" (but in 2016 switched back to Firefox), along with other Mozilla software. GNU IceCat is another derived version of Firefox distributed by the GNU Project, which maintains its own separate branding.WEB,weblink Re: ice weasel, September 23, 2007,

    Branding and visual identity

    Early Firebird and Phoenix releases of Firefox were considered to have reasonable visual designs, but fell short when compared to many other professional 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.WEB, Garrity, Steven, Branding Mozilla: Towards Mozilla 2.0,weblink February 8, 2009, October 23, 2003, Shortly afterwards, the Mozilla Foundation invited Garrity 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. Included were new icon designs by silverorange, a group of web developers with a long-standing relationship with Mozilla. The final renderings are by Jon Hicks, who had worked on Camino.WEB,weblink Branding Mozilla: Towards Firefox 1.0, Garrity, Steven, February 9, 2004, February 8, 2009, WEB,weblink Branding Firefox, Hicks, Jon, February 9, 2004, Hicksdesign, February 8, 2009, The logo was later revised and updated, fixing several flaws found when it was enlarged.WEB,weblink Spot the Difference, Hicks, Jon, December 17, 2004, Hicksdesign, February 8, 2009, The animal shown in the logo is a stylized fox, although "firefox" is usually a common name for the red panda. The panda, according to Hicks, "didn't really conjure up the right imagery" and was not widely known.The Firefox icon is a trademark used to designate the official Mozilla build of the Firefox software and builds of official distribution partners.Mozilla Trademark Policy for Distribution Partners Version 0.9 (DRAFT). Retrieved November 2, 2006. For this reason software distributors who distribute modified versions of Firefox do not use the icon.In June 2019 Firefox announced rebranding and introduced a new logo. The new logo is meant to encompass a larger family of products.WEB,weblink Firefox's new logo has more fire, less fox, Hollister, Sean, June 11, 2019, The Verge, June 12, 2019, WEB,weblink Firefox: The Evolution Of A Brand, Murray, Tim, Mozilla Open Design, 2019-07-08, File:Mozilla Phoenix logo vector.svg|Logo of "Phoenix" and "Firebird" before being renamed as FirefoxFile:Mozilla Firefox 3.5 logo 256.png|Firefox 3.5–22 from June 30, 2009 to June 25, 2013File:Mozilla Firefox logo 2013.svg|Firefox 23–56, from August 6, 2013 to September 28, 2017WEB, Martell, Sean, (Re)building a simplified Firefox logo,weblink Reticulating Splines, September 5, 2013, June 27, 2013, File:Firefox Logo, 2017.svg|Firefox 57 and later, since November 14, 2017File:Mozilla Nightly icon 2011.png|The 2011 Nightly logo, used to represent nightly builds of pre-alpha versionsFile:Mozilla Firefox Nightly logo 2013.png|The 2013 Nightly logoFile:Firefox Nightly Logo, 2017.svg|The 2017 Nightly logoFile:Firefox Nightly logo, 2019.svg|Current Nightly logoFile:Firefox Developer Edition logo.png|The 2015 Developer Edition logoFile:Firefox Developer Edition Logo, 2017.svg|The 2017 Developer Edition logoFile:Firefox Developer Edition logo,2019.svg|Current Developer Edition logoFile:Mozilla Aurora icon.png|The 2011 Aurora logo, used to represent an alpha releaseFile:Mozilla Firefox Aurora logo 2013.png|The 2013 Aurora logoFile:Deer park globe.svg|Blue globe artwork, distributed with the source code, and is explicitly not protected as a trademarkMozilla Trademark Policy FAQ: "What are the Mozilla Trademarks and Logos?". Retrieved November 2, 2006


    File:Firefox mascot - FISL 16.jpg|thumb|Firefox mascot at the FISLFISLFirefox was adopted rapidly, with 100 million downloads in its first year of availability.WEB, Palmer, Judi, Colvig, Mary, Firefox surpasses 100 million downloads, Mozilla, October 19, 2005,weblink February 4, 2007, This was followed by a series of aggressive marketing campaigns starting in 2004 with a series of events Blake Ross and Asa Dotzler called "marketing weeks".WEB, Ross, Blake, Blake Ross, Week 1: Press reviews, Blake Ross, July 7, 2004,weblinkweblink" title="">weblink August 5, 2004, February 4, 2007, Firefox continued to heavily market itself by releasing a marketing portal dubbed "Spread Firefox" (SFX) on September 12, 2004,WEB, Spread Firefox: Sfx Team's Blog, We're igniting the web. Join us!, September 12, 2004,weblinkweblink" title="">weblink January 25, 2007, February 4, 2007, It debuted along with the Firefox Preview Release, creating a centralized space for the discussion of various marketing techniques. The release of their manifesto stated that "the Mozilla project is a global community of people who believe that openness, innovation and opportunity are key to the continued health of the Internet."JOURNAL, Krishnamurthy, Sandeep, August 1, 2009, CASE: Mozilla vs. Godzilla — The Launch of the Mozilla Firefox Browser, Journal of Interactive Marketing, 23, 3, 259–271, 10.1016/j.intmar.2009.04.008, A two-page ad in the edition of December 16 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.WEB,weblink Mozilla Foundation Places Two-Page Advocacy Ad in the New York Times, December 15, 2004, Mozilla Foundation,weblink June 28, 2018, live, June 15, 2010, 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.WEB,weblink Set a Guinness World Record Enjoy a Better Web, Colvig, Mary, July 2, 2008, Mozilla Blog, Mozilla Foundation,weblink" title="">weblink January 12, 2011, May 30, 2008, This resulted in an official certified Guinness world record, with over eight million downloads.NEWS,weblink Firefox 4 sets unofficial download record, Keizer, Gregg, March 27, 2011, Computerworld, August 21, 2012, 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."WEB, Snyder, Ryan, Spread Firefox, Mozilla Blog, February 25, 2011,weblink May 15, 2012,weblink" title="">weblink June 1, 2012, In celebration of the third anniversary of the founding of the Mozilla Foundation, the "World Firefox Day" campaign was established on July 15, 2006,WEB, World Firefox Day Launches, Sfx Team, Spread Firefox: Sfx Team's Blog,weblinkweblink" title="">weblink December 10, 2006, January 24, 2007, July 16, 2006, WEB,weblink Mozilla Foundation Announcement, July 15, 2003, Mozilla, and ran until September 15, 2006.WEB, Friends of Firefox Frequently Asked Questions,weblinkweblink" title="">weblink November 16, 2007, November 27, 2007, 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.The Firefox community has also engaged in the promotion of their web browser. In 2006, some of Firefox's contributors from Oregon State University 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.WEB,weblink Take Back the Field, Oregon State Linux Users Group, August 14, 2006, August 28, 2011, After Firefox reached 500 million downloads on February 21, 2008, the Firefox community celebrated by visiting Freerice to earn 500 million grains of rice.WEB,weblink 500 million Firefox downloads: complete; 500 million grains: in progress, Colvig, Mary, February 21, 2008, Mozilla Blog, Mozilla, June 24, 2009, Other initiatives included Live Chat, a service Mozilla launched in 2007 that allowed users to seek technical support from volunteers.WEB,weblink Firefox Support Blog " Blog Archive " Firefox Live Chat launching today, Tenser, David, December 28, 2007, The Mozilla Blog, August 6, 2009, The service was later retired.NEWS,weblink Firefox Live Chat Support, Brinkmann, Martin, January 2, 2008, gHacks Technology News, May 2, 2014, To promote the launch of Firefox Quantum in November 2017, Mozilla partnered with Reggie Watts to produce a series of TV ads and social media content.WEB,weblink Mozilla Blog, November 14, 2017, The Mozilla Blog, July 23, 2018,


    In December 2005, Internet Week ran an article in which many readers reported high memory usage in Firefox 1.5.NEWS, Finnie, Scot, Firefox 1.5: Not Ready For Prime Time?, InformationWeek, December 8, 2005,weblinkweblink" title="">weblink June 24, 2009, January 24, 2007, 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.WEB, Goodger, Ben, Ben Goodger, About the Firefox 'memory leak', MozllaZine weblogs, February 14, 2006,weblinkweblink" title="">weblink July 17, 2011, November 17, 2007, Other known causes of memory problems were malfunctioning extensions such as Google Toolbar and some older versions of AdBlock,WEB,weblink Problematic Extensions, January 24, 2007, MozillaZine Knowledge Base contributors, January 19, 2007, MozillaZine Knowledge Base, or plug-ins, such as older versions of Adobe Acrobat Reader.WEB,weblink Adobe Reader, January 24, 2007, MozillaZine Knowledge Base contributors, January 17, 2007, MozillaZine Knowledge Base, When PC Magazine in 2006 compared memory usage of Firefox 2, Opera 9, and Internet Explorer 7, they found that Firefox used approximately as much memory as each of the other two browsers.NEWS,weblink Which New Browser Is Best: Firefox 2, Internet Explorer 7, or Opera 9?, January 24, 2007, July 19, 2006, Muchmore, Michael W., PC Magazine, Softpedia noted that Firefox 1.5 took longer to start up than other browsers,WEB,weblink Mozilla Firefox 1.5 Final Review, September 22, 2006, November 30, 2005, Muradin, Alex, Softpedia, which was confirmed by further speed tests.WEB,weblink Browser Speed Comparisons, January 24, 2007, Wilton-Jones, Mark, How To Create, Internet Explorer 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.WEB,weblink Firefox Preloader, April 26, 2007, SourceForge, 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.NEWS, Larkin, Erik, Radically New IE 7 or Updated Mozilla Firefox 2 – Which Browser Is Better?, PC World, October 24, 2006,weblink May 18, 2007, WEB, Dargahi, Ross, IE 7 vs IE 6, Zimbra, October 19, 2006,weblink January 24, 2007, 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.NEWS, Ryan, Paul, Firefox 3 goes on a diet, eats less memory than IE and Opera, Ars Technica, March 17, 2008,weblink June 1, 2008, NEWS,weblink Browser Performance Comparisons, Ryan, Wagner, March 26, 2008, June 1, 2008, CyberNet News, WEB, Firefox 3.0 Beta 4 Vs Opera 9.50 Beta Vs Safari 3.1 Beta: Multiple Sites Opening Test, The Browser World, March 29, 2008,weblink June 1, 2008,weblink" title="">weblink June 16, 2008, In mid-2009, BetaNews benchmarked Firefox 3.5 and declared that it performed "nearly ten times better on XP than Microsoft Internet Explorer 7".NEWS,weblink The final score: Firefox 3.5 performs at 251% the speed of 3.0, Fulton, III, Scott M., July 1, 2009, May 4, 2010, 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.NEWS,weblink Browser Speed Tests: Firefox 3.6, Chrome 4, Opera 10.5, and Extensions, Purdy, Kevin, January 26, 2010, May 4, 2010, Lifehacker, 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 (WebGL 2 is current as of version 51; and Java and Silverlight stop working as of version 52)—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.WEB,weblink Benchmark Analysis: Windows 7 and Ubuntu 11.10, Overa, Adam, February 21, 2012, Tom's Hardware, April 8, 2012, In June 2013, Tom's Hardware again performance tested Firefox 22, Chrome 27, Opera 12, and Internet Explorer 10. They found that Firefox slightly edged out the other browsers in their "performance" index, which examined wait times, JavaScript execution speed, HTML5/CSS3 rendering, and hardware acceleration performance. Firefox also scored the highest on the "non-performance" index, which measured memory efficiency, reliability, security, and standards conformance, finishing substantially ahead of Chrome, the runner-up. Tom's Hardware concluded by declaring Firefox the "sound" winner of the performance benchmarks.NEWS,weblink Chrome 27, Firefox 22, IE10, And Opera Next, Benchmarked, Overa, Adam, June 30, 2013, Tom's Hardware, May 2, 2014, In January 2014, a benchmark testing the memory usage of Firefox 29, Google Chrome 34, and Internet Explorer 11 indicated that Firefox used the least memory when a substantial number of tabs were open.NEWS,weblink Chrome 34, Firefox 29, Internet Explorer 11: Memory Use 2014, Brinkmann, Martin, January 2, 2014, gHacks Technology News, May 2, 2014, In benchmark testing in early 2015 on a "high-end" Windows machine, comparing Microsoft Edge, Internet Explorer, Firefox, Chrome, and Opera, Firefox achieved the highest score on three of the seven tests. Four different Javascript performance tests gave conflicting results. Firefox bested the others on the Peacekeeper benchmark, but was behind the Microsoft products when tested with SunSpider. Measured with Mozilla's Kraken, it came second place to Chrome, while on Google's Octane challenge it took third behind Chrome and Opera. Firefox took the lead with WebXPRT, which runs several typical HTML5 and Javascript tasks. Firefox, Chrome, and Opera all achieved the highest possible score on the Oort Online test, measuring WebGL rendering speed (WebGL 2 is now current). In terms of HTML5 compatibility testing, Firefox was ranked in the middle of the group.WEB,weblink Spartan Benchmarks: Spartan vs. IE, Chrome, Firefox, and Opera, Tanous, Jim, April 1, 2015, TekRevue, January 10, 2016, A similar set of benchmark tests in 2016 showed Firefox's Javascript performance on Kraken and the newer Jetstream tests trailing slightly behind all other tested browsers except Internet Explorer (IE), which performed relatively poorly. On Octane, Firefox came ahead of IE and Safari, but again slightly behind the rest, including Vivaldi and Microsoft Edge. Edge took overall first place on the Jetstream and Octane benchmarks.WEB,weblink Battle of the best browsers: Edge vs. Chrome vs. Firefox vs. Safari vs. Opera vs. IE, Coppock, Mark, May 27, 2018, Digital Trends, January 10, 2016, As of the adoption of Firefox 57 and Mozilla's Quantum project entering production browsers in November 2017, Firefox was tested to be faster than Chrome in independent JavaScript tests, and demonstrated to use less memory with many browser tabs opened.WEB,weblink Firefox Quantum vs. Chrome: Which Is Faster?, Murray, Matt, November 18, 2017, Digital Trends, April 23, 2018, NEWS,weblink 5 Reasons to Try Firefox 'Quantum' Browser, Lynn, Bryan, November 15, 2017, Voice of America (VOA), October 31, 2018, Robbins, Jill, TechRadar rated it as the fastest web browser in a May 2019 report.WEB,weblink The Best Browser 2019, May 20, 2019, July 15, 2019,

    Market adoption

    {{Further|Usage share of web browsers}}File:Usage share of web browsers (Source StatCounter).svg|thumb|300px|Usage share of web browsers according to StatCounterStatCounterDownloads have continued at an increasing rate since Firefox 1.0 was released on November 9, 2004, and {{as of |2009|7|31|lc=y|}} Firefox had already been downloaded over one billion times.WEB,weblink Firefox: 1 billion downloads only part of the story, Shankland, Stephen, July 31, 2009, CNET News, December 19, 2009, This number does not include downloads using software updates or those from third-party websites.WEB,weblink Spread Firefox: Mozilla Firefox Download Counts, February 14, 2007, Mozilla,weblink" title="">weblink July 17, 2005, 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.In July 2010, IBM asked all employees (about 400,000) to use Firefox as their default browser.WEB,weblink IBM names Firefox its default browser, Shankland, Stephen, July 1, 2010, CNET, November 21, 2013, Firefox was the second-most used web browser until November 2011, when Google Chrome surpassed it.NEWS,weblink Chrome Overtakes Firefox Globally for First Time, December 17, 2017, December 1, 2011, Amir, Eggheck, StatCounter, According to Mozilla, Firefox has more than 450 million users {{as of|2012|10|lc=on}}.WEB,weblink Mozilla: $104 Million In Revenues, 400 Million Users, Google Deal Running Through 2011, Siegler, MG, November 18, 2010,weblink June 29, 2018, live, June 8, 2011, {{As of|2019|9}}, Firefox was the second-most widely used desktop browser, and that position makes it the third-most popular with approximately 4.44% of worldwide usage share of web browsers across all platforms.WEB,weblink Desktop Browser Market Share Worldwide {{!, Statcounter Global Stats |publisher=StatCounter |date=August 1, 2019 |accessdate=September 4, 2019}}{{bar box|title=Desktop/laptop browser statistics|titlebar=#DDD|width=440px|barwidth=250px|float=center|bars={{bar percent|Google Chrome|#A3D3FF|69.08|69.08%}}{{bar percent|Mozilla Firefox|#A3FFA3|9.55|9.55%}}{{bar percent|Safari|#A3D3FF|7.41|7.41%}}{{bar percent|Internet Explorer|#A3D3FF|4.99|4.99%}}{{bar percent|Microsoft Edge|#A3D3FF|4.71|4.71%}}{{bar percent|Others|#A3A3A3|4.25|4.25%}}{{bar gap|height=11}}StatCounter for September 2019HTTPS://GS.STATCOUNTER.COM/BROWSER-MARKET-SHARE/DESKTOP/WORLDWIDE/#MONTHLY-201909-201909-BARPUBLISHER=STATCOUNTER, }}For a while Internet Explorer (IE) and its successor Edge were more popular than Firefox combined, but with the decline of IE's share they are no longer and Edge more popular than IE, which used to dominate.According to the Firefox Public Data report by Mozilla, active monthly count of Desktop clients has decreased from around 310 million in 2017 to 260 million in 2019.WEB,weblink Firefox Public Data Report,, May 26, 2019, Firefox has had much success in some countries and continues to have. It's still, {{as of|September 2019|lc=y}}, the most popular browser on traditional PCs in e.g. Eritrea and Cuba, with 78.15%WEB,weblink Desktop Browser Market Share Eritrea, StatCounter Global Stats, en, 2019-09-06, and 68.19%WEB,weblink Desktop Browser Market Share Cuba, StatCounter Global Stats, 2019-09-06, of the market share, respectively.

    See also




    Further reading

    • BOOK, Cheah, Chu Yeow, 2005, Firefox Secrets: A Need-to-Know Guide, O'Reilly, 978-0-9752402-4-3,weblink
    • BOOK, Feldt, Kenneth C., 2007, Programming Firefox, O'Reilly, 978-0-596-10243-2,
    • BOOK, Granneman, Scott, 2005, Don't Click on the Blue e!: Switching to Firefox, O'Reilly, 978-0-596-00939-7,
    • BOOK, Hofmann, Chris, Marcia Knous, John Hedtke, 2005, Firefox and Thunderbird Garage, Prentice Hall PTR, 978-0-13-187004-8,
    • BOOK, McFarlane, Nigel, 2005, Firefox Hacks, O'Reilly, 978-0-596-00928-1,weblink
    • BOOK, Reyes, Mel, 2005, Hacking Firefox: More Than 150 Hacks, Mods, and Customizations, Wiley, 978-0-7645-9650-6,
    • BOOK, Ross, Blake, Blake Ross, 2006, Firefox for Dummies, Wiley, 978-0-471-74899-1,

    External links

    {{Sister project links|wikt=Firefox|q=no|s=no|d=Q698|b=Using Firefox|voy=no|m=no|mw=Firefox|species=no}}
    • {{Official website}}
    • {{dmoz|Computers/Software/Internet/Clients/Web/Browsers/Firefox/}}
    {{Mozilla projects}}{{Aggregators}}{{Timeline of web browsers|2000s}}{{Web browsers|desktop}}{{Authority control}}

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