Chrome is my primary browser. For some things I still use FireFox though (version 4). Overall, I find Chrome more stable but recently a few of my plugins have been causing me issues. I am yet to have any issues with FF 4 in regards to stability. The only thing that pisses me off is where the refresh button is lol.

I originally moved to Chrome as FF couldn't handle large amounts of text (such as editing an IPB template).

Chrome FTW.