Like many of the rest of you out there, I love hacking around with web sites and adding functionality to Firefox by plugging in a few Greasemonkey scripts. Do you know what to watch out for when Greasemonkey scripts go bad? You have probably seen the warning up on UserScripts.org but I wanted to touch base to let you know what you should be looking for.
The main problem is that people are writing scripts that steal your cookie. With your cookie, they can grab other information such as your login and other sensitive information. They say these are two things you should search any script for before installing:
For more tips on how to stay on the safe side, I would recommend reading through this thread via the UserScripts.org forums. It has a lot of handy information if you install and uninstall a lot of Greasemonkey scripts.