I used Firefox 99% of the time for a number of years and a had a 'plethora' of cool addons for it. But then when I got into using a pc with Windows 7 and didn't have any other browsers installed yet, I began cruising the web with IE 9 and to my surprise, I found it to be pretty OK. It's fast (unless loading a complex js page sometimes) and loads most things right. I recently found a couple of pages where it doesn't load an item or spaces it out wrong, where the other 2 browsers do correctly, but I have little issues with Opera and Chrome, as well. As far as speed and performance, I really don't mind IE now. I don't have any cool things here like I did on Firefox, though.