Firefox is superior in every way.
I have Firefox with a couple of useful plug-ins: Adblocker, which means no pop-ups or ads ever - not even the BB banner ads ;) and also Foxtrick, the Hattrick helper plug-in.
Then there's tabbed browsing. I've two tabs open at the time of writing: one watching my scrimmage and one on the forums. IE has tabs but they're no good!