Today, using Fedora 37 and Firefox, a search for YouTube videos gave some
links with "Your browser can't play this video. Learn more. Switch
camera.".
The video I tried seemed to play properly in Firefox (sound and video) on
an
old iMac 14,2 with "nVidia GK107M [GeForce GT 755M Mac Edition]" graphics.
--
George N. White III