Works flawlessly Rated 5 out of 5 stars

This is a serious sanity-preserver. Google are really failing at usability these days, and YouTube is no exception in their vast empire. I, like many (many) others, open videos in background tabs to view at my leisure -- and with awful old Flash, I can just use the excellent FlashBlock to prevent autoplay. But with the nicer plugin-free HTML5 videos, YouTube's disregard for user choice shines through and all videos start playing. This addon does exactly what it says on the tin.

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