I'm using Chrome more and more. I find 3.6.13 slow and clunky - it quite often fails to load pages and takes two or three attempts to get to pages that I know are fine with other browsers.
Before when I've had Firefox issues I've found disabling some add-ons solves the problem - but one of the reasons I liked FF was that it was quick & I could choose some useful add-ons to improve it.
Chrome is slowly convincing me its the best for me.