Well, for security reasons I use my browsers for different things.
IE is java-enabled so I only run RS on it.
Firefox is java-disabled and I use it for most general browsing and junk.
Chrome, I think is the best but I don't use it much. I use it for secure stuff (banks, PayPal), e-mail, and the lovely Google Voice plugin.
Opera I use for general manual proxies.
TOR I use for simple proxy use. Firefox base.
I know you didn't need to know that but it's good to separate your browsing =p. Yes, I know e-mail and banking shouldn't be combined, but I don't get any fishy e-mails.