Solid. Increasing volume doesn't ruin the actual quality and haven't experienced a website that it doesn't work on. Wish it was verified to make me feel comfortable using it.

Highly recommended add-on. Simple and useful application. 5 stars.

реально помогает

Awesome extension, Highly recommended.Increases volume much higher than its original volume.

very useful app and highly recommended.

useful

Old laptop always had crappy speakers. This app fixes that. Thanks

Ottima. Con questa estensione posso gestire il volume della tab che mi interessa senza dover modificare il volume di sistema.

Great add-on, Works perfectly

it is really amazing app. thanks firefox.

brilliant app,excellent with dolby atmos

Great! It does what it says it does. Happy Camper.

It is amazing.

Perfect works on 98% of programs, LOve it.

Works through my bluetooth speakers too!