Finally had enough of all the auto play videos and went about disabling them in about:config. Noticed my email notifications stopped playing sound.
Determined the key "media.autoplay.default" being set to anything except 0 caused the problem. Hard to decide between annoying autoplaying videos and no longer being notified about new emails when my laptop is closed.
Open the settings page, then open "Page Info"( Ctrl+i ), go to the Permissions tab, find "Autoplay" uncheck "Use Default", and select "Allow Audio and Video".
Finally had enough of all the auto play videos and went about disabling them in about:config. Noticed my email notifications stopped playing sound.
Determined the key "media.autoplay.default" being set to anything except 0 caused the problem. Hard to decide between annoying autoplaying videos and no longer being notified about new emails when my laptop is closed.
Is there a workaround by chance?
This is in Firefox/Waterfox