I just added it and it seems to work as it promises.

love this addon

Ne marche plus ? Ben alors une étoile !

Fixed my laptops low sound issue. Before I could hardly hear a thing now I have to turn it down.

Simple, easy to use, does what it says it does. Easy 5 Stars

Perfect as it its. A volume slider & booster that works amazingly!

Genuine life-saver. Perfect for people like myself that have hard of hearing issues. Some videos are simply too quiet and this saves my life. Makes content way more enjoyable.

A great option for people like me who don't hear well to amp up the volume

As it says: simple and reliable. Awesome.

Nothing more, nothing less. Perfect.

Does what it says on the tin! Simple to use but an amazing improvement to browsing and youtube.