Spread Firefox

Mozilla Firefox

Screenshot of Firefox 57 running on Windows 10
Developer(s)	Mozilla Foundation Mozilla Corporation
Initial release	September 23, 2002; 15 years ago (2002-09-23)
Stable release(s)
Standard 57.0.3 / 28 December 2017; 5 days ago (2017-12-28) Extended Support Release 52.5.3 / 28 December 2017; 5 days ago (2017-12-28)
Preview release(s)
Beta & Developer Edition 58.0beta / November 8, 2017; 55 days ago (2017-11-08) Nightly 59.0a1 / November 13, 2017; 50 days ago (2017-11-13)
Written in	C++, JavaScript, HTML, C, Rust
Operating system	Windows, macOS, Linux, Android, iOS (Unofficial ports to BSDs, Solaris, OpenSolaris, illumos)
Included with	Debian, Ubuntu, Linux Mint, Manjaro Linux, Firefox OS
Engines	Gecko, SpiderMonkey, iOS-bundled version of WebKit (iOS only)
Size	Windows, IA-32: 34.1 MB Windows, x64: 36.8 MB macOS: 52.4 MB Linux, IA-32: 53.5 MB Linux, x64: 51.2 MB Android, ARM: 40.45 MB Android, ARM64: 44.09 MB Android, x86: 45.36 MB iOS: 98.3 MB
Available in	91 languages
Type	Web browser, mobile web browser, feed reader
License	MPL 2.0
Website	firefox.com
Standard(s)	HTML5, CSS3, RSS, Atom

Mozilla Firefox (or simply Firefox) is a free and open-sourceweb browser developed by Mozilla Foundation and its subsidiary, Mozilla Corporation. Firefox is available for Windows, macOS and Linux operating systems. Its sibling, Firefox for Android, is available for Android. Firefox uses the Gecko layout engine to render web pages, which implements current and anticipated web standards. An additional version, Firefox for iOS, was released in late 2015; however, because of artificial restrictions imposed by Apple Inc., it is forced to use the platform-bundled WebKit layout engine.

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 in November 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.