Grease Monkey (GM) is a Firefox add-on that allows you to use scripts with Firefox (FF). Scripts can allow you to do various things that FF, I use scripts on Facebook to Help my Facebook experience. Here are the 3 things you need to use Greasemonkey
To test to see if your shiny new script is enabled in GreaseMonkey, right-click the icon mentioned earlier, then click "Manage User scripts..."
You'll get this screen (Fig-4) that shows the bottom script in the list is enabled and the rest have been temporarily disabled (grayed out).
Note: You'll only see the script name and check-mark if you happen to be on the page that the script is made for, otherwise it won't show in the context menu, but you can still always get to it by clicking the mentioned Manage User Scripts menu item.
I will be posting on some scripts I Like next !