Dynamic Base16 by Thibaut

This extension requires a separate program to work properly.
Follow the installation instructions here.

This add-on extends dynamic base16 theming capabilities to your browser. The only way firefox can communicate with your computer is through the native messaging API, which allows extensions to run whitelisted programs and communicate with them.

The firefox-native-base16 program can watch a TOML configuration file for changes on your computer, and immediately communicate the color changes to firefox via the extension.

Works best paired with Flavours for dynamic base16 theme changes.