I'm on Ubuntu-MATE 20.04, and by reading the negative comment it seems it does not like Linux... yeah, I can confirm it.

I need to reload each and every single tab to activate it, making it pretty useless,
If I open a link in new tab (another youtube video) I do need to reload that new tab as well, it's very inconvenient!!

In the beginning it muted my left speaker, then I moved the slider left to right to make it works, increase of volume is far from the +20db, but instead barely 3db.

This could have been better if without problems, the UI is nicely made though, sadly I uninstalled it, reloading a tab to be able to use the equalizer... No thanks

Stop and restarting, and moving seekbar causes multiple volume boost.
That's not how it suppose to be.