Hmmm…my system is a Dell Optiplex 990 SFF PC so about 14 years old and seems to run Youtube without issues or buffering. I have yet to see if any local media does the same. But I’m also running 16gb of RAM which is the system’s max and it’s pretty much not had any issues since giving it that much.
https://9to5linux.com/mozilla-firefox-134-is-out-with-support-for-touchpad-hold-gestures-on-linux
At least has some of them. I think they always grab the betas and aggregate the release notes/changes during the nightly/beta tests.