There are many similar extensions.
This is the only one that does not require permission to "access your data for all websites".

UI could be improved though. Volume should default to 100 instead of 10, and I would like to hide the 3D spatialization features.

Great experience with that one. First thing first: you can adjust every tab to your liking. One is too loud but you don't want to close or silence it? Use "Amplify" and set it to 101% and you can't really hear it anymore. A video is generally way to silent? "Amplify" full throttle and Volume between 30-40 for a normal experience. Keep in mind that not all Website (reddit) support that extension, but that isn't because OF the extension but because of reddit/the Webiste.

OBVIOUSLY if you close a tab or the Browser, it sets back to the default, because you are also closing the tabs that you adjusted. Please keep in mind that it makes sense as every tab is adjusted separately.

i saw asmongold use it and i downloaded too

saw asmongold using this so I got it for myself

asmongold brought me here

Exactly what i was looking for, balance audio either left or right channel for each tab. Works great.

THIS is the best if you need to AMPLIFY your volume above 100% !

works perfectly for my needs, without those suspicious permissions required for all the other volume control addons

Great to boost the volume of individual tabs

отлично прибавляет звук, когда на ноутбуке уже вся громкость на максимуме, теперь нормально смотрю тихие фильмы онлайн, спасибо!

Finally can balance the sound of some broken youtube videos.