Codeforces Dark Theme 作者： Gaurav Patidar

Codeforces Dark Theme is a lightweight browser extension that applies a dark, high-contrast reading and coding experience to Codeforces. It ships all runtime assets locally, including theme CSS and editor styling, and lets you enable or disable the theme from the popup. The extension is minimal, fast, and easy to install in developer mode.
The code is open source
Open Source