Chrome: YouTube Pause allows you to solve one of the worst first-world problems around: figuring out which YouTube tab you need to pause. This extension just gives you one button that silences them all.
This extension is handy if you often find yourself watching multiple videos or lots of open tabs. We discovered this while searching for a Chrome alternative to YouTube Smart Pause, a Firefox extension that automatically pauses YouTube if you switch to another tab. While the majority of people seem to prefer Chrome over Firefox, it looks like there’s something for everyone!
YouTube Pause [Chrome Web Store]