Updating review. It worked, but not what I'm looking for.

This extension applies one setting across all of firefox for eq only.

I'm looking for eq and comp in one; the ability to apply across all tabs OR individually, set different presets per tab.

Using this plugin + a separate comp plugin does not work properly, either providing audio doubling or preventing this plugin from working until the page is reloaded.

I've swapped to firefox from chrome, where I had a plugin that did what I described I was looking for above. It allowed me to cut low end and semi-normalize audio all in one click, so I don't disturb neighbors using my big speakers in my apartment. I use an old audio interface so using something like equalizer apo isn't possible.

For now this plugin gets me halfway there, but I'd like to see the inclusion of a simple compressor or limiter in the future.