I recently put FireFox on my wife Carols Laptop. It has Windows xp sp 3 for the OS. It really sped things up on it. She is real happy with the change from IE 8. I was so impressed with the difference it made I installed FireFox on this desktop however I really haven't seen much of an improvement in speed. The OS is Vista64 sp2. Any comments or suggestions? One thing I really do like is the ad blocker.