Long ago I used to test all the browsers that there were (FF, Chrome, Opera, even Safari) in order to see what could be more confortable for me.
Safari is just shit to me. Too buggy and classy and heavy and Apple.
Firefox is pretty customizable (a lot of extensions and personas blah blah) and it works fine, but for me is a little too much full of things (Talking about FF 4, I used it long ago, as I say).
Opera is clean and pretty for me. It has not very much things on the browser instead of the page content but it's still complete (e.g. it has progress bar while chrome DOESN'T). Buuuut I dropped it for some reason I don't remember.
So I'm using Chrome because it's simple and fast, and if I am surfing the web I don't want to see too many things coming out of the browser that are not the page itself
tl;dr Chrome