Something I do not like about IE (and other MS software) is the fact that they integrate it too much in the OS. I would love to see IE (and Messenger) as ordinary standalone programs. You download the installer, if you don't like it, uninstall it.

Another example: Firefox is set as my default browser. However clicking a link in Messenger still opens up IE. Really frustrating. Anyway, I do not understand people still use IE after having tried Firefox. Seriously.

To finish this post: one of my favorite Firefox extensions are mouse gestures. They speed up the browsing experience tremendously!