"Official release day was August 16th and the way things are going the successor simply called Firefox 7 might launch as soon as September 27 2011. This is just some six weeks away and Mozilla blog has revealed that Firefox 7 uses less memory compared to Firefox 4, 5 or 6 and that on average it needs 20 to 30 percent less, and sometimes even 50 percent less. Naturally this means that Firefox 7 is faster and it should also be more stable. Firefox 8 also needs even less memory than Firefox 7, but the difference is not so dramatic.