Bagus, simpel, berwarna baik, dan enak dipandang mata.

Knappe extentie

i usually like very minimalist themes and this might not fit that bill exactly but it is the best nondefault theme i've seen yet. it's elegant, functional, and it makes me not hate being on the internet as much. it's good enough to be included by default in my opinion.

The best theme for Firefox.

Awesome colour theme, one of the best available.

non-intrusive yet beautiful. match well will system UI