I use chrome almost exclusively.
i use chrome for my personal email account, financial accounts and things i trust not spamming me and things i would regret getting hacked.
i use FF for the email addy i give to potential spammers, ECF , other forums and what-not. if this gets hacked, it's no big deal. if it gets spammed, no big deal. i don't always check this one daily.
i use IE for one damn account that won't play well with others.
using different browsers i don't have to "switch identities" . chrome remembers one identity, FF the other.