The option to disable Youtube autoplay does not work. The 'Completely stop videos instead of only preventing autoplay' option works as a stop gap, but then you have to refresh the page to get back to the previous video because the back button can't go back.
I found this extension looking for a solution to this specific problem and I did not find it, however everything else about the extension looks pretty good and I'm glad I found it regardless. -1 star for the disable autoplay not working, but if that issue is fixed I think this extension is 5 stars.