I am using Firefox because of it's huge range of add ons. Opera is a close second though, I'd switch to it if there were more add on's and it was supported more.
I use FireFox, it is the only one that i am comfortable.I also like it because of the mods i made over the past year.
My personal favorite browser is Safari, though my parents and siblings all use Internet Explorer.
I use Opera it's one of the fastest browsers that I used.
I use firefox at the moment but i might be switching to another browser soon but i can't decide either opera or google chrome.
Chrome, I used to be a FF fan because of plugins but gradually I just found myself opening Chrome rather than FF more and more and began to care about the plugins less and less lol
Personally I love Chrome the best. I like the cool themes, the speed, the stability, and that's it's made by Google. I mean, who doesn't love Google?
IE8 for me i have used every other one there is and i havent liked them as much as ie8