Well, read the source of jquery. You will see fixes for "old new features" of FF that broke applications in the past. Given the way mozilla teams are still wor

Well, read the source of jquery. You will see fixes for "old new features" of FF that broke applications in the past. Given the way mozilla teams are still working I guess it can still happen. EDIT and add the memory leaks and the change of performance that happens from time to time in new releases.