Outdated, installation is not recommended. Rated 1 out of 5 stars

This extension is very outdated. It has not been updated for almost half a year and is plagued with a lot of problems. See the 1 star reviews.

Better Replacements for this Add-on:

You will require Greasemonkey and the following scripts:

☼ Youtube Prevent Autoplay [by Yansky]
http://userscripts.org/scripts/show/12008

☼ Download Video as MP4 [coded by Gantt]
http://userscripts.org/scripts/show/25105

☼YouTube HQ + 720p Ultimate [Avindra Goolcharan]
*If you install this, you will not require the 2 scripts above.
http://userscripts.org/scripts/show/31864

I hope this helps anybody who is looking for a replacement for this extension.