No Sound in Firefox with Windows 11

[mobula]

Hello,
I am new here and I am German, so pleas overlook the gramer and spelling.
Sinc I updated to Win 11 I don't have any sound when there is a video on the Firefox website.
If i try a different browser then everything is working okay.
I can not get any sound from Youtube for example.
My system sound is ok, I also can play music, VLC media player, from my Pc perfectly.
I checked drivers, new installation, problem solving and everything what is suggest on help sites.

Any ideas...

Cheers Georg

[BruceAWittmeier]

https://support.mozilla.org/en-US/kb/wh ... any-sounds

[mobula]

Hey,
I tried everything what they suggested on the help site, with no luck......