Firefox and Chrome are what I use. IE..what a joke. Thats like taking a cross country journey in a horse drawn buggy when you own a Cessna 172.
I use Opera as it is very fast, Firefox due to various reasons and now i have started using Google chrome due to its best features, such as if one tab closed, it frees up the momery which is not in anyother browser.....
I use Firefox, Internet Explorer, and Chrome. For good reason to. I usually use all 3 to test my sites appearance
Firefox is the primary browser, but have IE as a backup. I am not ready to jump on the Chrome bandwagon.