My advice: don't use it. Firefox is traditionally more secure, faster, and more stable. Until it's proven to be inferior to IE, I won't switch back. IE is integrated into the OS, which poses greater security hazards. FF is not. FF plays animation like .gif and flash more smoothly, and it can be customized for greater speed and practicality. I've been using it for years now and I am very happy with its performance. I love windows, I hate IE. My only issue with FF is that occasionally updates for plug-ins like Flash come out late and on a couple of occasions I didn't install an update because it wasn't compatible with an add-on I was using and I experienced a lot of crashes. That's the other side of the coin I guess.