Does NOT work. Tried using this with FF 57 on Windows 10 Pro (64 bit). Installed it then restarted FF. Went to youtube and set it for 1080p, Turn Off Annotations and No Autoplay.

Launched various youtube videos but in each case, this add-on did NOT change the video resolution to a higher one. Instead the resolution was the original default for that video. Still had to manually change the resolution on each video just like before.

It also did NOT turn off autoplay. Once again I had to do that manually for the first video. Same thing for turning off annotations. It did NOT turn off annotations. I still had to do that manually for each video just like before installing this add-on.

I tried exiting FF and then starting it up again and then logging back into youtube. But the results were the same. This product does NOT work.