As previously mentioned in this thread, anyone on the fence about Mozilla/Firebird/Opera should download Avant. It's a shell for IE that gives it all the functionality of the web browser component of Mozilla and Firebird. It's blazing fast, kills pop-ups, has mouse gestures, lets you open links behind your current tab with a middle mouse button click, and includes just about anything else a modern web browser should (only issue is security, but we're savvy enough to deal with that I would think). Plus since it's just a shell you keep all your settings and have all the functionality of IE. Best solution of them all, in my opinion.
http://www.avantbrowser.comThe download is less than a meg and it has a painless uninstaller if you hate it. I can't really see how someone could, though.