Mozilla Firefox 4 is a web browser developed by Mozilla Foundation , available for download in full install version for Windows platforms from legacy sources. This version of Firefox was officially released on 2011-03-22 for public access and a brief summary of important updates and change log pertaining to this edition can be read below.

Firefox 4 is released with plenty of functionality additions, performance tuning and bug fixes and a complete list of release notes can be read at Mozilla website.

Firefox JavaScript performance is now 6 times faster than its previous edition, thanks to the JigarMonkey's splendid Java Engine. Now you can synchronize your browsing between all your devices as the sync engine has been enabled by default.

Now Firefox takes advantage of Hardware accelerated graphics cards by including support for Direct2D Hardware acceleration. In the user interface side a completely redesigned bookmark and history code let the browser performs those task in superb speed with reliablitiy.