Mozilla Firefox (originally named Phoenix and then moments known as Mozilla Firebird) is an independent transition web browser developed by the Mozilla Foundation and hundreds of volunteers.

Before launching version 1.0 on November 9, 2004, Firefox has received excellent response from the media, including from Forbes and the Wall Street Journal. With over 5 million downloads in the first 12 days of release and 6 million through November 24, 2004, Firefox 1.0 is one of the most widely used open source software among home users.

Through Firefox, the Mozilla Foundation aims to develop a small, fast, easy, and highly developed web browser (separate from larger Mozilla Suite). Since April 3, 2003, Firefox and Thunderbird email subscribers have become the main focus of the Mozilla Foundation developers to replace Mozilla Suite.

Firefox can run on various operating systems like Microsoft Windows, Linux, Mac OS X, and FreeBSD. The latest stable version of Firefox is now 26.0, released on December 10, 2013.


Features offered by Firefox include tab usage, spell checking, search, bookmarks, recovery, download and private browsing sessions. Firefox uses several web standards, including HTML4 (as well as some HTML5), XML, XHTML, CSS, JavaScript, and DOM.

Among the popular features of Firefox is the built-in popup blocker, and the connection mechanism for adding additional functionality. While these features are available for some time in other web browsers such as Mozilla Suite and Opera, Firefox is the first web browser to receive results on this scale. Firefox is targeted at getting about 10% of Microsoft Internet Explorer’s market share (the most popular web browser with big margin (until 2004) until 2005, which has been referenced by many as web browser battle years.