Firefox video support is broken in Facebook after update to v.136
After updating FF to v. 136.0 in Linux Mint 22.04, I noticed a problem with video playback in Facebook in some posts. A black screen appears with the message "Sorry, there were problems playing this video". The problem also occurs after disabling all plugins and deleting the user.js file from the profile. The problem does not occur after starting firefox in troubleshoot mode, but then hardware acceleration using the GPU does not work (Compositing: WebRender (Software)). I noticed that in version 136 there were some significant changes in the topic of video decoding. https://www.phoronix.com/forums/forum/software/desktop-linux/1524008-firefox-136-beta-finally-enables-hardware-video-decoding-for-amd-gpus-on-linux-by-default I have an NVIDIA GT1030 GPU with 2 MB VRAM.
Christopher
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Not familiar with Linux but you said it work in troubleshoot mode and this to me would mean you got Addon or other 3rd party software causing the playback issue this from a Windows OS user.
In FF 137.0.1 under Linux Mint no more HW acceleration: https://www.reddit.com/r/firefox/comments/1j70l8f/firefox_freeze_during_video_autoplay/
Facing the same issue with both AMD and Nvidia gpus on Ubuntu 24.04. I was wondering what was wrong since it has been working on both of them. Both of them use Mate as their desktop. One is a radeon igpu and another one is a gt 1030 like the user right from above. All the codecs directly show as unsuported on both of my devices. Both are .deb installs and not snaps.