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Re:Elevator.js – A “back to top” button that behaves like a ... by jaifraic on Wednesday June 24, 2020 @07:57AM (#23626845)
With Chromium based browsers you should be able to set every website to be muted at first. You'll only see a mute symbol on the tab when the tab tries to play sound.

If there is no sound at all, there shouldn't be an icon.

Re:Elevator.js – A “back to top” button that behaves like a ... by globular-toast on Wednesday June 24, 2020 @10:55AM (#23628524)
That does sound like what I want. This is the first time I've heard of a compelling reason to use Chromium over Firefox. Hope I can find a decent solution for Firefox.