You forgot Google Chrome! I have used them all. IE is so slow. Firefox just has too much.(hard to explain there) Used Flock too, that's pretty good for social networking, just has a slow start up load. But Google Chrome is so fast to me. And is so easy to use with the tabs and downloads.
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ever since firefox came out ive been using it and it took a while to get used to but i love it. what i loved about it were the tabs but it looks like ie got those shortly after firefox. but still firefox pwns