Firefox also has an "IE Tab" add-in that will allow you to designate sites to be opened with IE, and also allow you to reload a site in an "IE Tab", which appears to be IE running inside Firefox on one tab.
I love Firefox. We have been using it for a while. IE just kind of takes over your pc and does whatever it wants to so we just don't use it at all anymore.
I tried it but it was too much like using IE7, which I couldn't stand. I went back to IE6.
I like their add ons and i like how i can customize like.. EVERYTHING!