Nope. IE only. Firefox doesn't work with OWA, and that's something I need to make frequent use of. Tabbed browsing sucks, I like having multiple windows up. It plays GIFs improperly, and it hangs and crashes constantly. Never had a single problem with IE, popups or spyware on my systems, so I've never had a reason to switch. I tried it to see what all the hubub was about, but it was like going back to IE 2 that came with Windows 95.

Anyone who actually has problems with spyware and popups and browser hijacks probably fucking deserves them, anyway.