Is there an add-on or extension that will allow a tab indicate if the sound plays?

I am on an iMac, El Capitan running. Thank you.

https://addons.Mozilla.org/en-us/Firefox/addon/noise-control/

Firefox 42 will have this feature built-in to Flash as well.
https://www.Mozilla.org/en-us/Firefox/42.0beta/releasenotes/

Tags: Firefox

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