Script Kiddie Jr. ##IRNOTAFGT

How do I wrote FireFox script? I've tried everything, but it's not working. I accidently my text editor as Works Word Processor, not Notepad.

I have this script - it's strictly for the lulz, it's a temporary page editor. The code looks like this -
javascript: document.body.contentEditable = 'true'; document.designMode = 'on'; void 0
but Greasemonkey won't take it.What do I do?