While I was upgrading my Anti-virus from AVG to NOD, I needed to uninstall Microsoft Defender (I've been suspecting the two of them to cause a few problems on my computer lately). I didn't find the uninstaller for Defender, so I went over to Microsoft to download Defender's installer.
Being greeted by the validation screen, I suddenly remembered that I was running Firefox and got a little scared that I had to switch browser to be able to validate my Windows XP (no Vista yet) installation.
But I decied to give it a try, and pressed the validate button. After downloading and installing a small program, the validation process went as smooth as it does in IE, and after a few minutes Microsoft Defender was uninstalled.
Thanks for letting me use the browser I want to use, MS :-)