Loved FF for years though I like the newest version of Opera better now. It looks a bit ugly at first and does a few annoying things, but you can change all the things that suck in the options as well as make it look nicer than FF + its faster. FF used to crash on me every once in a while, don't have that problem with Opera also.
Love how you don't need to download anything to hide banner ads, just get the link of the ad then you can tell it to block ads from that site.
Not to mention how handy the speed dial is!