Firefox 4 will release on 22 March and will be avilable for download from 7 AM according to American time.
Recently Microsoft launched its IE 9 and Google Chrome is improving day by day and now Firefox will release its new version with some really cool additional features like -
GPU accelerator for increasing speed
Synchronize with central server
Design will be same like Chrome and IE 9 and tabs will be above address bar. There will be very high competiton in IE, Chrome and Firefox lets see who wins.
Mozilla is planning to release its 5,6 and 7 version in 2011with some minor updates in Firefox 4