I use Chrome, but I really want(ed) FireFox to win this. I don't like helping Google gain another market, but FireFox ruined its browser with bad performance / memory leaks. FireFox left me no choice and I assume most web developers and technology peeps made a decision similar to mine.
Give a try to both and compare. Since you were resolute enough to make a switch out of performance concerns, you can as well switch again ;) Personally I never found Firefox to be performing bad enough to switch, even though Chrome could be better some time ago.
