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YouTube is now fully blocking ad blockers around the world
(9to5google.com)
This is a most excellent place for technology news and articles.
I did purge my cache on Ublock, not working for me.
Then try ro disable all other extensions that manipulate Youtube that could cause the Message to still appear.
Uninstalled FF and reinstalled, that worked. Interestingly I do not have this issue on my dualboot Ubuntu FF.