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Yeah, it's weird. Switched to Firefox Quantum as my main browser again, happened to use Plex and it was slightly laggy with huge cpu usage. Try it in chrome and it's smooth as always.

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I've seen comments that, at least on Linux it might not use GPU acceleration by default?

If this is the case for you, hit up `about:config` and change `layers.acceleration.force-enabled` to true. This heavily reduced tearing for me.

That is a must-enable setting for sure, but not video related. That's compositing.

Firefox still does not support VAAPI or VDPAU :(

It doesn't, see https://bugzilla.mozilla.org/show_bug.cgi?id=1280523

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