Google does A/B testing for anti ad blockers.

Not only do I get slowdowns and some videos don't load at all at times, but I also get a notification that explains that the reason is using adblockers.

Here I am, totally given up on adblockers, and no way I’m paying for premium, but jesus christ the amount of ads I get, sometimes seems to be one every minute, making most videos unwatchable.

Though it’s mostly good for my addiction since it makes me use youtube less.

For the last two days I haven't been able to watch youtube videos on Firefox without disabling uBlock.

I had the same problem. Make sure you're running the latest version of uBlock Origin. By that I mean you should explicitly check for updates and install the latest version. That fixed it for me.

I've disabled adblock/vpn and can watch maybe 1-2 videos before the video player starts blacking out on each one. Only restarting firefox "resets" it and I haven't been able to find a reason for this happening. Time for yt-dlp I guess

I disable youtube instead when this happens.

If I care enough I'll yl-dlp it to my jellyfin server, but yeah I mostly just don't bother.

Recently I've found Youtube to just show a white screen if it detects Firefox+uBO.

There's probably scripts you can add to your ubo to combat this.