I still find this version buggy and unstable. For starters, some survey thing kept popping up on it, and this crashed Firefox completely. The last time it did the same, only this time it lost 10Mb of an active download because of it. Tooltips stick the the screen, back does not take you to the point you were in the previous page on occaisions, I still think the interface is a little amateurish. Clearly it has come on lots though....
However, I've been using Opera browser today, and find it superior in almost every manner, so if you have an open mind, give Opera a try... you can find a serial for it easily enough to get rid of the banner ad.