Firefox ticks many boxes, but the one big cross it has had to bear over the years is the memory leakage problem that many users have experienced. Here's how it works: user has Firefox browser open and visits websites, Firefox slurps up some system resources, user continues to keep Firefox running, Firefox continues to slurp up ever increasing amounts of precious system resources. Well, that has been the allegation at least, and one which Mozilla has been long at pains to deny. Whenever the subject has cropped up, the official response has always been that there is simply no significant memory leakage with Firefox or anything else that uses the gecko engine for that matter thank you very much.
Until now.