See What Browser Window or Tab is Playing Audio / Video in Chrome Quickly
The newest versions of Google Chrome have a fantastic feature addition that allow you to instantly see what open web browser tab or window is playing audio. That may seem ho-hum, but if you’ve ever gone on a wild goose chase trying to figure out which tab out of 50 million tabs is playing some video or music in the background, you’ll know how valuable this little improvement is since it can cut down the cumbersome process of manually going through various tabs and windows to find which tab or website is making sound.
And yes, this trick works to identify browsing tabs playing audio or video, any sound at all, on Chrome web browser for all platforms that support the browser, including Mac, Windows, and Linux.