Wow vraiment cool.

With the equalizer, the playback speed does not change.

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.