Extension Room - Firefox extensions galore !

I have been using the Firefox browser for several months now and have quickly come to love it. Since then my copy of IE gets fired up for only those sites which were specifically written for it (bad sites! bad sites!). One of my favourites features of Firefox is its abilities to have add-ons or extensions. And today i ran into this site - Extension Room which seems to have extensions for anything i ever wanted to do with a browser.

Some of my favourites (because they are most useful) are: