Rated 3 out of 5 stars

too bad it is not updating anymore.
use greasemonkey with script Youtube Stopper" instead ;)

need update Rated 5 out of 5 stars

Great add-on, the 1.0.3 is not working at the moment, hope a new version is coming soon.

Great add-on but need update Rated 5 out of 5 stars

still worth 5 star... probably youtube website has changed.. hope this addon get update soon

This review is for a previous version of the add-on (1.0.1.1-signed.1-signed). 

Update is out, but it's not yet reviewed, check the description.