This should've been fixed in the latest, I think Mozilla pushed it, try manually checking for updates or pull it from the github page.
The issue was caused by a fix I put for Bluetooth for someone else, where his headphones werent resting when a video was paused.
So I started force stopping the audio hook when stream was off, but that caused as you see some pages not rehooking.
Again it should be fixed in 6.7; which again is available in the github, but may be waiting for approval from mozilla.
If its not fixed in 6.7 lmk in the github.

This should've been fixed in the latest, I think Mozilla pushed it, try manually checking for updates or pull it from the github page.
The issue was caused by a fix I put for Bluetooth for someone else, where his headphones werent resting when a video was paused.
So I started force stopping the audio hook when stream was off, but that caused as you see some pages not rehooking.
Again it should be fixed in 6.7; which again is available in the github, but may be waiting for approval from mozilla.
If its not fixed in 6.7 lmk in the github.

You can blacklist the site in settings / click the active button off and refresh the tab.
Of course, two extensions using the same API w/ permission to the same site/tab would fight one another.

The mute should be fixed its a CSP issue; [x blocked the script and so when it tried to access it audio breaks, but thats why there's a blacklist.]