Firefox. I really like Chrome too, but I always go back to Firefox for the extensions. How anyone can browse the web without Adblock Plus is beyond me. It's not the fastest, but if you haven't used the 3.5 betas you're in for a big speed improvement.
I despise IE in all its forms, but especially IE6. Safari 4 beta is nice. Opera has problems with too many sites for my liking.
What's with the random link, anyway? I feel like I'm in some kind of sociological experiment.