How to turn off/on audio in a particular Chrome Tab
1. Install it by click on "Free" button
2. Click on "Add" button
3. Now, you can stop sound on a particular tab, by right click on blank place on that webpage, then click "MuteTab"->"Current tab"->"Stop" or "resume" if you would like to hear sound again on that webpage. However, "MuteTab" is not perfect, sometime it might not detect audio is playing on certain website. If you found that is the case, open it page by page, lol
If you think this is helpful, please recommend this article in g+1.