A new phenomenon has happened with Firefox and Youtube.
Suddenly I get no sound on Youtube videos, if they are playing on the http://www.youtube.com url. If I use pavucontrol, then I can see that the sound is set to 0 volume. So I change this and the sound works on the video. However when I put to mouse cursor ot another position of the video or when I start another video, then the volume gets back to 0 again.
This does not happen when I execute a Youtube video from another url where it is embedded. And everything is fine in the Opera browser.
I have already deleted the Youtube cookies in the Firefox, without any improvements. A restart did not help either.
This did never ever happen in the past with Mageia LInux. It is a completely new phenomenon.
What must I do that the Firefox AudioStream volume does not get automatically to Silence when I start a Youtube video on Youtube.com?