Opera. I haven't tried Chrome. Maybe I should. But I've tried the rest, and I much prefer Opera. Opera kind of feels like it's had all the fat trimmed off. When I use other browsers they always feel kind of clumsy to me. Part of that is just because it's so easy to customise Opera to be and to do just what I want. And I've also become habitually adapted to mouse gestures, so if I want to open a link as a tab in the background I just twitch my wrist. And when that doesn't do anything because I'm using a different browser, and I actually have to click a couple of things, it seems like a hassle. I also like the ability to easily recover tabs I've closed -intentionally or not. Also the ability to turn off flash ads and animations, or whatever I want, with one action. As well as the ability to purge personal data, cookies, history, cache, etc., with a click. (All easily customizable, of course.) And it's fast, too. So: Opera. I happily refuse to change.