A userChrome.css theme to bring Arc Browser look on Windows to Firefox. Work with Windows, Linux and macOS ✨
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Updated
Nov 14, 2025 - CSS
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 calm, tidy design for Thunderbird on macOS, with colourful spaces, message cards and a clear calendar.
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.
Auto-hide Firefox's top toolbars like Vivaldi's UI Auto-hide (userChrome.css + experimental extension)
Pywal colors for Zen Browser. Sidebar, tabs, background and URL bar follow your wallpaper live, no restart. Works with Pywalfox
Makes firefox transparent with colored tint
A quiet Firefox theme inspired by Linear and Apple Notes. No borders, tabs on the left or on top, and a browser that takes on each site's colour.
Min Firefox - browse without distractions
High-contrast read & unread email styling for Mozilla Thunderbird Supernova (Cards & Table view) via userChrome.css. Dark mode ready.
An attempt at making Firefox's Nova redesign less rounded and "touch-friendly"
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 quieter Firefox: Minimal Dark puts Firefox in one slim graphite row with one 1px accent. Plus XP Classic, Luna 2026 and Luna + Mac, a theme switcher and a Windows installer.
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
Make Firefox butter-smooth on any Windows machine: where to click, what each tweak really does, pros and cons, and a one-command undo.
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