Actually, I've used Firefox almost exclusively for years. However, on rare occasions I go back to IE for some special "Flash" editing. Since upgrading to IE 7, I've run into some problems that never existed with IE6. So, my conclusion is that while IE7 is probably more secure, it might be a little more unstable in some ways. Not sure I'm even going to do this, but thought I'd just check on the feasibility of doing it.