Doesn't seem to stops the preview window from autoplaying.

I wish Google would make YouTube more user-friendly but it is designed in a way to keep you in front of the screen as long as possible. It has become a bit less annoying thanks to this add-on. However, if used in combination with other YouTube enhancing add-ons it can create problems. Playlists keep auto playing videos, although I turned that off everywhere.
Basically, I cannot get YouTube the way I want and have to compromise..

As mentioned before, it works perfectly in one tab, but if you open a link from this tab to a new one it doesn't.

It's not working if you opening video in new tab. :/

Same as previous reviewer. Only works in the current tab. If I open a vid in a new tab it doesn't work.

But still it's better than nothing. Autoplay just loves turning itself back on constantly.