Great Concept _ but BAD creation.
1) anything above 100 % - there is a slight hum the background.

2) it doesn't "stay assigned" - Everytime i open firefox, I need to re-assign it to the level I need. .. ALL of the other extensions ... stay the way I set them - like my ad-blocker I do not "need to" ... 'turn it on' ... for every use.
I turn it on, set it & forget about it ...

this one I constantly need to "re-assign the level I had set the last time I had the browser open"

3) ( all of your keyboard shortcuts are already assigned by YOUTUBE, # keys refer to the chapter you want to watch, Arrow keys ALREADY assigned to control "move page up or down on page" , Right & Left arrows ( ALREADY assigned to move forward or Backward in video by ) 5 seconds.

4) STOP the constant need to ask questions !
( upon every use ) .. do you want to use this ad free - or pay for a premium to remove ads.

Yes - I am fine with banner ads.

Why the constant NEED to ask - if I already told you the answer.

if the extension app asks any more (stupid questions )... a questions I have already answered multiple times previously ) _ i will change my rating to a 0 star.

Simple to use. Outstanding controllable increase in volume. It really helps me with those low-sound videos.

Очень классный аддон!!! Оправдал ожидания

please add feature Not reload while boost up volume

Like another user mentioned, if you are using a CMS with TinyMCE this addon will inject a spam code while active. Stay well clear.

it does what it says

nice sound booster

It is extremely annoying to turn up the volume to the max and not be able to hear what someone is saying because of poor mic quality, or other reason... Thanks to you, I no longer get annoyed because of that! Thank you! :D