Says it 'works on everything', but when I try it, it specifically says on Bandcamp pages 'This page cannot be boosted'. At least it says that, and disables the option to try - unlike other boosters which try and just break Bandcamp.

Still looking for a Booster for Firefox that works with Bandcamp. I have an addon that gives a slider to reduce volume - but nothing to add to it.

I guess I will continue using Equalizer APO for Windows, and Easy Effects for Linux to do this. But I prefer to have an option in a browser also, because I'm lazy.

I will keep to try on other sites like Soundcloud, hopefully it can handle other audio sites. I use another addon that works well but only works for video pages sadly. It also breaks the sound on IMDB trailers (the other addon I use, not this one.. still have to test this one on pages other than Bandcamp).

good