There’s no official dark mode for GitHub (December 2020 update: yes there is!) but this doesn’t mean you must suffer the retina-burning white of the default design.
In this post I take a look at 8 options for going dark. The winner, in my opinion, is Dark Reader. So if you’re in a hurry, you may be excused.
First I’ll mention a few things about each of the contenders, then I’ll show them side-by-side in action across various GitHub pages. Beware, there are a lot of screenshots on this page; if bandwidth use is a concern for you, leave now while you still can.