Grease Monkey!!!!

Hey I am an avid use of Mozilla Firefox..cant use IE anymore..and i am totally a fan of the addons in Mozilla..

I think they are quite innovatively created..greasemonkey for example..and mouse gestures is also a good instance of this fact..

by grease monkey u can actually download videos from youtube..check out this link for the same:

http://www.hackszine.com/blog/archive/2007/02/howto_download_youtube_and_goo.html

you will find it very useful..

ppl are welcome to tell about other useful scripts related to greasemonkey :)