With this add-on active, all pinned tabs are killed when closing Firefox. That's TOO clean for me. Ad-free viewing of youtube videos isn't worth this hassle.

Doesn't remove shit in the end of videos.

Instead of temoving the ADS it leaves the ad on but removes the SKIP button and makes the ads unskippable!!!

It blocks ads on the cost of a very annoying lag in starting each video.
If you install it, you will have to wait at least 10 seconds and more each time you click a video for it to start.
Extremely annoying!
I don't recommend it.
Choose one that does not make any delay in Youtube video play