This is a (Firefox) add-on (WebExtension) that lets you invert the website's color scheme by inverting/changing the prefers-color-scheme media feature of CSS.
OTHER License
A GNOME👣 theme for Firefox🔥
Firefox Theme - For dark theme lovers / More compact / Modular / Blur
🦊 A Userstyle theme for Firefox minimalist and Keyboard centered.
Change the appearance of the web instantly
a glorified startpage