i use mozilla firefox and google chrome both are quite fast but ie is possibly the slowest browser know to man and woman
According to these studies http://www.howtocreate.co.uk/browserSpeed.html Opera wins on most aspects :B
I use Firefox religiously. Its a very good browser: safer, more reliable, and lots of great addons. The fastest though, I would say is Google Chrome. I use Google Chrome but its still relatively new therefore not very friendly with some sites.
I've never tried any other browser than Firefox (ignoring the standard IE), and I've never felt the need to switch browsers. 8D
I like firefox for its awesome efficiency.I also like Google Chrome but that is the second choice of mine.The most favourite browser of mine is only Firefox.