It works, but not in the way you might expect. The 600% boost is only true if you like loud sounding distortion. If your device has a weak builtin hardware chip amplifier, then this app may make the sound output of your device exceed its normal output levels. Then end result will be a loud distortion sound that could damage your speakers or headphones. More important than that, the loud distortion levels can result into unintended hearing loss issues for you with extended use. Please, be careful.

Very handy to have from time to time. Occasionally a random video will have it's audio balance set way too low and this is a life saver.

NOTED BUG: I use brain.fm for music and for some reason brain.fm won't play with this extension active. I tested each of my extentions independently and for some reason this one gives it trouble. I've reported it to brain.fm as well. LMK if there's a more appropriate place to report this bug.

Thanks for the tool!

Works exactly as expected, must have for watching movies and videos.

life saver

it works whenever it feels like

Funciona direito, é simples leve.

Many thanks for this perfect feature! It's awesome.....Best Frank

Excellent solution for one of the most annoying weak points of Youtube. One of the easiest to use extensions I ever used, just install and set the desired volume. It's just perfect.
I also hope youtubers learn how to record audio (I'm really fed of some channels using stereo mics for recording a single voice...)

Works just fine with most of the videos, but not with the music (on sites like vk.com) and music videos (auto-generated on youtube).
But that's not a big deal and I still recommend this extension to everyone.

Very handy for a laptop that has no volume to speak of!

This is the best of many boosters that I have tried.

funciona 10/10

Works instantly!!