Firefox for several years now also. I'd never go back to IE, mine is updated to 7 and it still sucks.
There is also something built into it that it don't even like to search for Firefox. When I first reloaded my computer last time I had to go to Google to download Firefox because IE wouldn't let me do it. Weird I know but I've had it happen on 2 different occasions.
If I type Firefox into IE's search bar it goes directly to the Firefox.ink file and won't even go to the web.