Firefox Developer Edition does not release sound handles
When closing out of Firefox or closing tabs, windows volume mixer entries aren't released. It's mostly just an annoyance, but it makes it so that it is very difficult after some time to control the volume from windows as it's not possible to tell which Volume mixer entry is active.
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Seems original didn't take image. Attached now.
Hi, I think it's a problem of pilots. I share the link that will help you
https://support.mozilla.org/en-US/kb/fix-video-audio-problems-firefox-windows
best regard