when i am forced to use ie i feel wierd, the most telling thing about how good firefox is is that once you use it you can't ever go back.
The tabs are simply genius and the middle click delete-undo delete makes everything so fast
my favourite thing is that the bookmarks folder at the top, one middle click and my top 8 favourites all open simultaneously and are all loaded within 30 seconds (although this is irrelevant, by the time i finish with the first the second is guaranteed to be loaded, then third, fourth etc).
If they really could sort out definitive extensions it would be perfect. Although I remember a few years ago when nothing (java, flash etc) would work and now it all does.
Also one final good thing (maybe bad, i hate monopolies in all forms) due to the google search box. Because google is simply so rich and powerful, if they totally back firefox microsoft will basically be f'd (sorry for the expression).
firefox, i adore it.
If you still have doubts, have a race with someone on ie on how quick you can read a forum