Firefox 4 is on the way this month, but Firefox 5, 6 and 7 might also be closer than you think. The developers at Mozilla has now released a roadmap revealing the plans for the Firefox browser this year.
According to the roadmap Mozilla will accelerate the development and distribution of new versions of Firefox much more often than before. If the developers can deliver according to plan, you will see Firefox 7 before the end of 2011. But before that, both Firefox 4, 5 and 6 will be released.