Can't uninstall FireRainbow Rated 1 out of 5 stars

Hi. I'm trying to uninstall FR, but it is not listed in the add-ons to do so. How can I uninstall it? I'm getting mixed up code in script area! (FF 5.0) Thank you.
[Updated]
I was not able to see "my add-ons" button at the top. I unistalled it 'cause I was getting mixed up code in script area. FF 5.0

This review is for a previous version of the add-on (1.4).