Honestly the most useful extension I have, right up there with adblock.
It's really good! I was a little surprised that it worked out so well. The quality doesn't change, but the volume does go higher and that's its intended purpose!
As you get older the hearing starts fading, This app is awesome, I can hear videos so much better since I installed the app.
chrome://extensions/shortcutsin the address bar and set your own shortcut to open Volume Master.