Sun Valley + MDL2 Theme for Firefox
MIT License
Fluent design gtk theme for linux desktops
Collection of userstyles affecting the browser
A Material Design-inspired userChrome.css theme for Firefox
Chrome Developer Tools Custom Theme
🦊 A Userstyle theme for Firefox minimalist and Keyboard centered.
Compact and minimal interface for Firefox
Firefox Theme - For dark theme lovers / More compact / Modular / Blur
A collection of css hacks and feature detection.
A GNOME👣 theme for Firefox🔥
A dark theme built for Codeforces
Brings the Windows 7 titlebar buttons to Windows 10/11 (And maybe other versions!)
userChrome.css theme for Firefox Developer Edition.
A set of themes for thunderbird inspired by a Monterail blog post
A responsive One-Line CSS Theme for Firefox.