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Today I learned that YouTube is deliberately crippling Firefox on Asahi Linux. It will give you lowered video resolutions. If you just replace "aarch64" with "x86_64" in the UA, suddenly you get 4K and everything.
They literally have a test for "is ARM", and if so, they consider...
It might just be a coincidence but I've had a lot of trouble using Invidious or Piped lately too. Videos load and titles load, but video thumbnails don't load for me.