I've tried many alternatives, but Dark Reader is hands down the best. Huge plus for the flexible settings: you can adjust brightness, contrast, add site exceptions, and even tweak fonts. It runs smoothly in Firefox and doesn't hog resources. Huge thanks to the developers!

世界上最牛逼的深色模式插件。

It saves my eyes from occational flashbang while surfing the web at night.

it works now
--- old ---
last update broke something - it slows down the browser and firefox asks if i want to stop this extension

One of the best extensions I've installed. Simple, effective, and doesn't bloat the browser at all.

The best dark mode add-on there is and nothing else comes close, visually it's brilliant! it dynamically and intelligently changes any page to look great depending on the different sites. I haven't seen one site that looks bad with it. The only problem is the performance hit on certain sites where it causes some slow downs, But it's so good that I don't really mind it that much.

Really solid extension. Clean and lightweight, fits perfectly into my workflow. Does exactly what it promises.