At last! I found a good but NOT excellent "Mute Tab". Suggestion: Have a choice of 4 colors... one BLACK (which it is), a white, a yellow or a red. Or, at least one more... WHITE! Thanks for the add-on! ☺

Does what it says : ) I would appreciate a customizable keyboard key combination to turn it on and off.

Nice to mute all Tabs.
Can you make a keyboard shortcut to mute all?

need color option (white)

I love that all my tabs are automatically muted, as I often click on several videos at once!
What's REALLY annoying, is when websites have embedded audio/video that starts immediately making noises and I can't even tell where it's coming from!
So, thanks for this! LOVE IT!!
I have not figured out how to remove the notifying icon from my tabs. Is that even an option, at this point?
This is useful, for sure, to see the status of each tab, but maybe an option to "whitelist" certain sites/pages to always or never show up.
Since there are no vids on the addons pages, for instance, I don't need to see the icon (nor even have the need of the feature), but it takes up space and blocks the tab titles for quick reference.
Thanks so much for this, dev!