Rated 1 out of 5 stars
Disable this add-on.
I've had it for around a year, and this has been my experience.
While it has some cool features, like lights off (I enjoy the darker setting, though you have to know where the button is to turn it off again, as it disappears once clicked)), I wondered for the longest time why a literal 80% of my youtube videos would not load, or would not load unless I sat and repetitively pressed refresh and prayed for it to somehow work.
It looks like a lot of other people are seeing the same thing-- the video shows up as a black box or momentarily looks as if it might load, only for the box to appear. I saw that when the features it displayed below my video loaded once I refreshed (I have a slower connection) the black box would always come back. I concluded this add-on could be the problem, just disabled it, and am overjoyed by the return of youtube's functionality. While the ideas have potential, the coding is counterproductive for the search to the best youtube experience.