A userChrome.css theme to bring Arc Browser look on Windows to Firefox. Work with Windows, Linux and macOS ✨

A minimalistic one-line userChrome.css theme for Firefox

A Betterbird / Thunderbird modding suite to bring back some of the UI and functionality of Postbox

A custom firefox css theme

Firefox userChrome.css to auto-hide the tab bar when it only contains a single tab

UserChromeJS/userChrome.css package that adds a Firefox toolbar button to auto-hide browser toolbars, with Ctrl+F11 shortcut and Tools menu entry.

Makes firefox transparent with colored tint

Min Firefox - browse without distractions

Auto-hide Firefox's top toolbars like Vivaldi's UI Auto-hide (userChrome.css + experimental extension)

High-contrast read & unread email styling for Mozilla Thunderbird Supernova (Cards & Table view) via userChrome.css. Dark mode ready.

Pywal colors for Zen Browser. Sidebar, tabs, background and URL bar follow your wallpaper live, no restart. Works with Pywalfox

A real-progress loading bar for Firefox's address bar, like Chromium/Helium's: follows actual page load progress, with a breathing glow. userChrome.css + autoconfig.

A compact and minimal Firefox UI for keyboard-centric users.

A compact Firefox theme in plain userChrome.css: navigation, URL bar and tabs on a single row. npx vulpine

🎮 Everblush GX — Opera GX-inspired Firefox theme with Everblush palette, glassmorphism UI, green glow effects, and Chrome-like density

Polished macOS-style window controls for Zen Browser with deep customization and animations.

Arc-style tweaks for Firefox

Minimal auto-hiding Firefox navigation toolbar - only the centred URL until you hover. Tab- and sidebar-neutral, so it works with native vertical tabs.

A compact, minimalist, Safari-inspired Firefox theme for macOS. Overlay on macFox.

My custom Firefox CSS.