This isn't a Firefox browser issue that is a Youtube support issue that you need to contact them about.

You may have been better off simply paying for youtube premium & using the free ad blockers depending what ur needs are! Origin or ublock r recommends though Im also looking for another 1 that blocks Youtube ads for free myself as my Adblocker stopped working yesterday. If you find 1 in your searches maybe u can update me? tx

I paid for the adblock premium and now youtube is not even skipping the ads, they just play and firefox doesnt seem to be blocking anything.

Interesting... You paid Adblock premium to block ads, but you're blaming Firefox....