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YouTube is deliberately crippling Firefox on ARM systems
(social.treehouse.systems)
This is a most excellent place for technology news and articles.
Then your uBlock Origin filters aren't working properly. See this thread for instructions on how to purge and update your filters to block YouTube's ads and YouTube's adblocker blocker.
I mean after clearing the cache it disappears. But I've seen the "your video player will be blocked" 3 or 4 times during the past few months maybe.
Those 3 or 4 times may have been after Google had updated their anti-adblocking stuff and before uBlock Origin had updated their anti-anti-adblocking stuff.
Also, do you have any other adblockers installed? Does your browser have its own adblocker? Either of those can cause interference with stuff like this.
Nope, I use Librewolf with uBlock Origin, uMatrix and BitWarden. Nothing else.
But yes, I haven't seen it in quite some time now.