Mozilla Firefox is a free and open source web browser control by Mozilla Corporation. Firefox had 22.47% of the documented usage share of web browsers as of July 2009, making it the 2nd most popular browser in terms of current use worldwide, after Microsoft’s Internet Explorer. Firefox runs on various versions of Mac OS X, Microsoft Windows, Linux, and many other Unix-like operating systems. We list the 50 that we think are the Greatest Firefox Wallpaper out there. We hope you like it.