Thanks for the tip. I think you meant `MOZ_LOG=PlatformDecoderModule:5 firefox`. When I run that with Firefox 81.0 I get this when I open Youtube: [Child 78229

Thanks for the tip. I think you meant `MOZ_LOG=PlatformDecoderModule:5 firefox`. When I run that with Firefox 81.0 I get this when I open Youtube: [Child 78229: Main Thread]: D/PlatformDecoderModule VA-API FFmpeg is disabled by platform [Child 78229: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type Same in Nightly 82.0b9. This is on a Dell XPS 13 amd64 with Mesa Intel® UHD Graphics (ICL GT1) running Ubuntu running Wayland. I haven't tested my RPI4 yet. But if Intel graphics aren't a "supported platform," it's difficult to imagine any graphics under Linux that would be. Didn't test trying to force-enable because we're talking about supported platforms.