This extension mute inactive tabs
This extension mute inactive tabs automatically.
In order to make this extension work you have to enable tab audio muting UI control in Chrome flags
To do so go to: chrome://flags/
Find Enable tab audio muting UI control.
Click on Enable.
Restart Chrome.
Voila!
try ligth version: https://chrome.google.com/webstore/detail/really-mute-inactive-tabs/jdecdhgamljdfjlhbgdclgfkkcbdbaen