I learned about this extension from an Asmongold video—he uses it to adjust the volume of online videos and enable mono audio output. That's why I recommend giving this extension

does everything it promises and more

working great on zen browser

works fine for me! for anyone having issues, it must be on y'alls end sadly. hope y'all can resolve it <3

Awesome cool feature.

Does the job amazingly!

Thanks to Chaython putting the source code on GitHub, you can check for yourself that everything's above board. The extension does exactly what it says on the tin!

this one actually works and should be at the top of the list.

Easy functionality for me, and worked like a charm thank you!

does what it says on the box

Thanks for the spectacular extension and link to source code; it is highly appreciated since most other "volume control" extensions on Firefox are sketchy or outdated. Works very well.