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Also "Youtube Video Skip Ad Trigger" is handy one for automatically pressing the "skip ad" button - so you don't have to!

If you use uBlock Origin, you shouldn't need it because prevents the ad from playing at all.

Hmm I def see ads on YouTube, is there maybe a setting I need to enable or ruleset? (I use the default )

I use Firefox an uBlock origin and definitely don't see ads on YouTube. I don't have any other ad blocking extension installed.