I have to say, i am a really big firefox fan since years! From time to time i try other browsers like opera and chrome too. For me, firefox with all his great addon like NoScript and AdBlock is the best browser. Now i have installed the new final Firefox 4.0 and the first thing is the new (lighted / cutted down) GUI which is not really how i like it but its okay. Something i really miss, is the Statusbar, where you can see source adress when hover a linkadress. The new firefox is really a lot faster as the old version and i am really a bit impressed! Now its time to use and play a bit around, to see how stable it works and what are the good/bad sites of the new GUI. Btw, all of my old addons seems to work.