Unlike the current version 4 Firefox, Mozilla is now seeking a new version in a very short period of time. As you may know all of the Mozilla took a lot of time to launch the final version of Firefox 4 with 12 betas and RC 2. But now after the release of Firefox betas of 7 5, Mozilla Firefox releases the final 5 on servers FTP.
According to the will of the launch of Mozilla Firefox Page Mozilla officially released on June 5, 21. 5 will not bring any changes to Firefox, and graphical user interface instead of the interface design will be almost the same as Firefox 4. Most of the additions is not compatible with Firefox now 5.