Funny, after years of using Firefox i removed it a week ago after i tried chrome at work. Sure the extensions for Firefox are great but the browser itself is slow as molasses in January.
Right now i mostly use Chrome and occasionally Opera (can't get used to that browser).

Opera

Safari.

For recent versions: Tools->Add-ons
For any version: addons.mozilla.org

Firefox.

I prefer Opera :)

Internet explorer 8. Though sometimes i use the ingame internet browser that steam has.

Opera. When Netscape Navigator got too old for usage, around the turn of the century, i search far and long for a non-ie based web experience. Sadly, it got a bit clunky since 10.x, a way better now [12.x], not perfect [8/9.x] yet.

only Opera.i noticed..americans mostly firefox,europeans opera

Firefox: adblock and noscript, there's no other way to go.

Thats not really the point. If I'm being ignorant, I'll gladly be proven wrong. But I have disabled all keyword searches, URL fixing etc on Firefox and not really sure Mozilla have much interest in what I'm searching for. I've not heard of Mozilla logging keystrokes, but if you any evidence stick up some links please. Would like to read them.

Well, there's always the fact that the exact details of my computer and internet life is nobody's damn business. Then there's the fact that as the owner of my computer, including the memory and cpu, it should be up to me how these system resources are utilized.

The argument "If you're not doing anything illegal then you have no reason to be creeped out by being constantly monitored" is simply ridiculous. Privacy is an important legal right in some places, and if you've ever been stalked by a creepy violent person then most likely you can also appreciate it philosophically. I don't care if it's the police, my psycho ex girlfriend, or the entire global advertisement industry. I don't want any of these people or anyone else to know things about my computer that I don't elect to tell them. It's just none of their business.

Then there's the bandwidth, processor time, and system memory that spyware takes up. Anything more than zero is too much, in my opinion. If you have a higher limit than that, that's your thing. And you, and I, and everyone else should be free to make that decision.

What other browsers?

I try. I do like Opera at times, I still use FF 3.6 for NoScript/Adblock functionality. Sadly it looks like IE 9 or 10 might be the next evolution, they may be sticking in a lot more flexibility to turn stuff off (while nicely supporting all the HTML 5/CSS3 stuff when you want it). It's too bad it'll be Windows only.

Eventually FF 3.6 will no longer really be supported so I have to keep looking.

I was at a huge open source conference this week, CSS3 and HTML5 people still talk about graceful fallback for Lynx type browsers, some people still care.