Firefox 137.0 no longer plays any Video's for me, after switching from 136

Hopefully it helps other’s, who may run into this problem.

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@Kobold

While I was struggling to write English, the thread closed. Lol I never make it in time.

There are several, but you may have tried turning the following on and off.

As far as I can see, YouTube seems to be using vp9/webm a lot these days.

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I’m on an AMD desktop and just ran into this problem. None of these fixes seem to apply (haven’t tried rolling back yet). Not only will e.g., Youtube videos not play, but I have a dedicated profile for playinf videos from my Emby server, and those won’t play, either.
Ryzen 9 3900x
RX5700xt

Codec Name	Software Decoding	Hardware Decoding
H264	Supported	Supported
VP9	Supported	Supported
VP8	Supported	Unsupported
AV1	Supported	Unsupported
HEVC	Supported	Supported
AAC	Supported	Unsupported
MP3	Supported	Unsupported
Opus	Supported	Unsupported
Vorbis	Supported	Unsupported
FLAC	Supported	Unsupported
Wave	Supported	Unsupported

I also tried it with other websites, not only youtube as i mentionend already.

Maybe its not related to Firefox? This could be a distro audio issue.

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