Userscripts.org

Just exactly how can u edit the script?

1. Right click on the monkey face in the bottom left hand corner of your FireFox browser window.
2. Click on "Manage User Scripts...".
3. Wait for the dialog box to open.
4. Select the script from the list on the left.
5. Click on the edit button at the bottom of the dialog.
6. Say "Hello" to your uncle, the one called "Bob".

must need something..says "choose ur preferred text editor first"

You need to point it to the editor you want to use. You can search these forums for suggestions on all of this.

Here's one thread: http://userscripts.org/topics/18937