only this one worked for me, others are just a garbage

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totally worth it use freelly without doubting us

Love this Add-on works as advertised.

suppi

You know an add-on is good when you don't click "no" when it asks for a rating. Simple and does exactly as it advertises. If you need a volume booster, just get this one.

This is the best sound booster that you can find on the Internet. Thanks for making this service available to users of the Firefox Browser.

Works perfectly - just move 'slider' across - and the result is immediate. Best of all - unlike two others I've tried - this one causes no distortion. Just nice clean sound. I'm using headphones, and Firefox browser.

отлично

This is a great extension that does what it says on the box.

very nice :)

this add on does exactly what it is meant to do, perfect!