If I sign out of my google account in Chrome it drops from 0.9 to 0.7.

I could have sworn I'd never signed in to Chrome using my google account, but I guess I must have mistakenly signed in to gmail or something.

I use FF as my main browser, only ever drop back to Chrome sporadically, or when I really want tabs to be completely isolated (there are some annoyingly CPU/power intensive stuff I do from time to time, and I can just renice Chrome while I get on with other stuff.)