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10 Reasons You Should Switch From Chrome to Firefox.
(www.howtogeek.com)
This is a most excellent place for technology news and articles.
Given Google and YouTube's history of intentionally and maliciously disrupting other browsers that aren't chrome, it'll be a safe bet that it's intentional.
https://www.zdnet.com/article/youtube-is-slowing-video-loads-on-firefox-heres-how-to-fix-that/
So, the solution is to disable the adblocker? Not gonna happen
I use pihole. It's external to a browser extension and performs the same without the in browser complaints about using an ad blocker.