Facts seem to go out the window in these discussions.
Google Chrome is the fastest renderer. Google Chrome also has adblock options that are almost as good as adblock plus.
But.
Firefox 3.7 (yes, its an alpha but I've been using it without a crash/problem on trading and news websites for some months) is almost as fast as Chrome (not actually as fast but almost).
Firefox 3.7 does the nice "open child tabs next to the parent" you get with Chrome.
Firefox 3.7 runs all the other add-ons you get for Firefox and (to me) has a slightly better look and feel.
So I use FF 3.7 but ... the faster one is by a nose Chrome.