Rated 5 out of 5 stars

@Ginryuu (or anyone else who wants to make this work): you can get this to still work by closing Firefox, going to your profile\extensions\check4change-owner@mozdev.org\chrome\content folder, open all 4 of the .xul files (notepad works) and delete the copyright symbol on the 5th line of each. Save the files and restart Firefox.

This review is for a previous version of the add-on (1.6).