For me it was a must to have a theme changer like Vivaldi to Firefox. Luckily I have found this addon.. Works flawlessly and you can even change color options from the settings.. Superb work.

I love this so goddamn much, I can't believe how pretty firefox can look--probably would have abandoned the browser if not for this; I'm that shallow.

Absolutely fantastic

Missing updates... :( This addon rocks!

Omg, I've been looking for this in Firefox.