The extension looks amazing and is exactly what I was looking for! The only issue I have with it is that it doesn't work outside the extension option page or your website page.
The only error I can see, and maybe it is not relevant, is when I look at the background page in the extension settings there is this error in the console:
185Error in response to tabs.query: TypeError: Cannot read property 'id' of undefined
at Object.callback (<URL>)
at S (<URL>)
at Object.x [as shareSpeakVolume] (<URL>)
at nr (<URL>)
at Function.sa (<URL>)
Thanks a lot for any help,
Looking forward to using this extension and contributing to it!