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We need after install press addon icon on target tab and volume up.
works perfectly

Does what it says on the tin. I've not encountered any problems using it over the span of a couple of years.

Great little app for the hard of hearing like me! One click and your done. Does not distort the sound, which is a big plus, I use it for Firefox and have had no issues with it, so if you need an app to boost the sound this is a great choice.

Made an account just to review this add-on, its very good.

this is what i wanted

ottimo !
funziona son tutto

Does exactly what it is supposed to do. 5 stars because of that.

Great