8/6/13 Not Working Rated 1 out of 5 stars
Love this product. The Design is flawless, but YouTube updated and it is no longer working on the site. It just takes you to a separate window.This review is for a previous version of the add-on (1.6.5).
You probably don't have the latest version (1.7.6). I've linked to it on the extension's page:
If you do have the latest version and it still doesn't work, contact me at email@example.com to see what's wrong.