Mozilla Firefox is a free and open source web browser descended from the Mozilla Application Suite and managed by Mozilla Corporation. A Net Applications survey put Firefox at 25% of the recorded usage share of web browsers as of November 2009, making it the second most popular browser in terms of current use worldwide after Microsoft's Internet Explorer, and the most used browser independent of any one operating system.
- Mozilla Foundation
- Windows 2000, Windows XP, Windows Vista, Windows 7, BSD, GNU, Linux, Mac OS X, Solaris, OpenSolaris, Unix, XULRunner
- MPL, GPL, LGPL