This the only equalizer that actually works for youtube videos on my Firefox on Gnome/Debian.

Would give 5 stars if I could adjust equalization manually.

I like it just a little lower on bass, since it's trendy to put a lot of basses and I dislike that very much.
Some presets allow me to lower the bass but it's not ideal.

The menu button doesn't show up. Otherwise it would probably be a great addon

Der Menü Knopf ist nicht da. Sonst wäre es wahrscheinlich ein tolles Addon

EDIT: I don't know, when it appeared (probably after a restart), but now its there and its working perfectly fine

Sometimes doesn't appear, in addition with YouTube dark theme the presets list is very hard to see.