Been contemplating for a while now.. But I've made the change and I'm well impressed with firefox and its add-ons! Have a very easy to use screenshot and page capture add-on, FLV downloader in like 1 click, and image zoom. Beats IE7 hands down..alot faster too in loading, aswell as tabbed browsing.
Anyone with IE.. Change!.. You wont regret it
I find the page located at about:mozilla (type it in firefox) very wierd though! Kind of satanic!