Absolute LIFESAVER!!

I have been using this a few days now, and nearly the only limitation affecting me, fullscreen, is mentioned in the extension info. :) Theater mode doesn't work, and other users say playlists don't work; neither which does not hurt too much in my case, but be wary.

Fortunately (LPT!!) Firefox's picture-in-picture lets you go fullscreen on any PiP-able video, so, all I need to do is click the PiP icon, then double click the player or hit the arrow to go fullscreen.

So no convenient F key shortcut to go fullscreen, BUT:
You can still press C for captions and M to mute as usual, plus pause with space, arrow keys for vol/skip, ,. to frame skip, shift + ,. to change speed, and number keys to jump around.

1. The ability to open YouTube links normally from across the web, plus
2. mostly functional keyboard support
are huge benefits to me versus FreeTube, the open-source app that I tried as a different solution to my recent woes with YT anti-adblock. If this extension isn't for you (e.g. because of the playlist problem) and you don't mind clicking to navigate, check out FreeTube.

Thank you "meeeeemu" for the great extension that's saving my YouTube experience from those god-awful ads.

UPDATE: Doesn't work for age-restricted videos, but they are rare enough that I can find a way to cope

It works, it's not great and disables a lot of features but that fact that it works out weighs any downsides.

Sencillamente, funciona. Aunque supongo que el desarrollador deberá ir actualizando la extensión a medida que Youtube se entere de esto. Pero por ahora, no hay bloqueo de ningún tipo, y el aviso apenas se ve una décima de segundo.
Después de algún tiempo de uso he comprobado dos cosas: primero, ralentiza mucho la carga de la página de un video; segundo, si te quieres descargar el video disminuye la velocidad hasta que se corta la descarga. En general, se puede decir que ralentiza Youtube, aunque quienes tengan una conexión de alta velocidad tal vez no tengan problemas.
Por mi parte, he tenido que desactivarlo.

f-kin A

Works exactly as described, when the video playback gets disabled, it thinks for a sec, then plays your video!! Working as of August 23, 2023

does what it's intended to do and mentions what drawbacks will be experienced

Does indeed prevent the new adblock-block. It does however make playlists bug out.
After a couple of seconds the video in the playlist will be skipped and this continues until the playlist is done.
Whilst annoying, it's better than normal yt right now

Thank you so much for this!