AvantBrowser does everything I've seen mentioned in this thread, without having to track down and install extensions. It also does a few things (e.g. page zoom) that I haven't been able to find for firefox. The interface is more customizable (and better looking, imho), and it evens allows the google toolbar (never could get that to work with firefox).
It's a smaller download than firefox, too.
Oh, and all the stuff that only runs with IE will run with AvantBrowser (mostly because it is a shell extension for IE).
www.avantbrowser.com