Experiencing lots of stuttering while playing video with Firefox 83.0 on Windows 10. Happens with Disney+, Netflix and YouTube. Microsoft Edge (Chromium) on the same system works without any issues with all of these. Tried to enable / disable hardware acceleration, webGL and some other settings people are commenting on forums, to no avail. Tried updating video drivers, using different settings including frequency / resolution, none of these had any effect on the issue. Windows 10 version used was 1909. Will try again after upgrading to 20H2 and post back if anything changes. Trivia: also tested Opera, which suffers from the same problems. Common video codec with Firefox, maybe?