Keep Quiet Utility - Mute unwanted sounds on Firefox
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Add-on summary
Once installed and enabled via the toolbar button, Keep Quiet will automatically mute all new tabs and windows. If a particular tab contains audio that is desirable to listen to, clicking the speaker icon on the tab will allow the content to be played.
Please note that since I first released this add-on, others have stepped up and developed new sound control utilities with richer feature sets that I never had the time to add myself. I will update this plugin if it simply stops working in a future release of FF but I would recommend the others if you desire more flexibility.
Add-on safety
Risk impact
Keep Quiet Utility requires a few sensitive permissions. Exercise caution before installing.
Risk likelihood
Keep Quiet Utility is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.