Thank you! Auto adding videos I didn't watch to my history was driving me crazy!

As someone who dislikes previews (since YouTube adds that video to your watch history if you let it go for too long) this has been a must-have for me since YouTube keeps re-enabling previews in my settings.

Does exactly what it says it does. No more autoplaying previews. Nice and clean look, 10/10 extension

Firefox needs restarting for it to work.
I was looking for a way to permanently disable previews and this worked.
The "video previews" switch in youtube's settings needs to be disabled per-device and also turns itself back on after a while(!).
And this add-on seems to disable previews permanently. Thank you!

Seems to work fine, very helpful, thanx!