Greasemonkey my new firefox experience

I use firefox since version 1.5 or below. Follow some of its news and related and heard the greasemonkey too many times. but never learn or use it.

Yesterday its a chance! I try to write script to control some game on facebook :P. And I found It just like javascript which i am skillful.

It like coding javascript in my own page. it's so easy to write and control things. Don't mind the compatibility with ie because it run on firefox only! (Or other browser that surely support mozilla javascript)

This is acctually my great experience.