Earlier quoted context omitted.
I just switched today. After installing the omnibar extension and removing the ugly bar in the bottom, if feels just as comfortable as Chrome.
I use Chrome for google apps because it works better. I use Firefox for everything else.
Uh, also I suggest to everyone the "self-destructing cookies" extension. I think it's the best cookie solution so far: basically it deletes the cookies after a certain "grace period" unless they are into your white list. This means that (1) your session is forced to last only for slightly more than the time you are on the website (2) you don't stand out as tinfoil-hat (https://panopticlick.eff.org/)