https://news.ycombinator.com/item?id=23199062
I'd recommend just using dark reader or writing a simple user-script
I'm serious - try it. Only issue is that some monitors' dimmest setting is still too bright.
You could also get a user-styles extension.
https://news.ycombinator.com/item?id=32719488
It also solves the "Why no light mode?" problem ;-)