There are video playback issues on both desktop Firefox and Android Firefox, but there is no category for both. However, I considered not being able to play the videos at all a more serious issue. https://files.catbox.moe/aypxqq.mp4 This is a sample video. The HEVC video plays on android, but with lag as if there were no hardware acceleration while it plays fine on Chromium-based browsers. This same issue was present on desktop Firefox, but then hevc support disappeared in one of the updates altogether. https://ott.dolby.com/codec_test/index.html This page shows that HEVC isn't supported, despite nobody on the web reporting this bug. And neither is HDR supported for some reason. Despite Firefox Android having the same report from that site apart from the user agent, it's seemingly able to decode that video on CPU, whereas on Windows it shows a Mimetype error. Disabling hardware acceleration doesn't make Firefox play it on the CPU. Is there a fix for these?