Mozilla Firefox is a free and open source web browser descended from the Mozilla Application Suite and managed by Mozilla Corporation. Firefox had 22.51% of the recorded usage share of web browsers as of May 2009, making it the second most popular browser in terms of current use worldwide, after Internet Explorer.[4]

To display web pages, Firefox uses the Gecko layout engine, which implements some current web standards in addition to a few features which are intended to anticipate likely additions to the standards.[5]

Firefox features include tabbed browsing, a spell checker, incremental find, live bookmarking, a download manager, and an integrated search system that uses the user's desired search engine (Google by default in most localizations). Functions can be added through add-ons, created by third-party developers,[6] of which there is a wide selection, a feature that has attracted many of Firefox's users.

Firefox runs on various versions of Linux, Mac OS X, Microsoft Windows, and many other Unix-like operating systems. Its current stable release is version 3.0.11, released on June 11, 2009.[7] Firefox's source code is free software, released under a tri-license GNU GPL/GNU LGPL/MPL.[8] Official versions are distributed under the terms of a proprietary EULA.[9][10]

http://en.wikipedia.org/wiki/Firefox_(web_browser)

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