I use Opera I have done for some time, I just like the have it your way interface. It does crash now and then, but mostly due to the Netscape plugin interface (meh). I tried Firefox when it was Firebird and Pheonix, but the whole thing felt clunky and like a big botch together. I’m not saying don’t try it, but there are alternatives.
Opera my browser of choice is great and used on many strange and wonderful devices such as the Wii. However if you install IE7 and then install Maxthon 2.0 Beta you may be highly impressed like I was how snappy and modern it all feels. If I couldn’t use Opera or I must use an IE I use Maxthon 2.