🦊 I respect proton UI and aim to improve it.

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• Updated Oct 18, 2026
• SCSS

A GNOME👣 theme for Firefox🔥

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• Updated Oct 19, 2026
• CSS

A tool to install, manage and use Progressive Web Apps (PWAs) in Mozilla Firefox

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• Updated Oct 31, 2026
• JavaScript

A very shy little theme that hides the entire browser interface in the window border

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• Updated Jan 21, 2025
• CSS

Custom CSS tweaks for Firefox

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• Updated Aug 23, 2025
• CSS

A Material Design-inspired userChrome.css theme for Firefox

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• Updated Sep 23, 2024
• CSS

A Userstyle theme for Firefox minimalist and Keyboard centered.

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• Updated Apr 24, 2022
• CSS

Firefox CSS Theme - Dark theme / More compact / Modular / Blur

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• Updated Nov 8, 2026
• CSS

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 responsive One-Line CSS Theme for Firefox

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• Updated May 23, 2026
• CSS

An opinionated set of configurations for firefox.

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• Updated Apr 11, 2023
• CSS

The ultimate theme manager for Firefox-based browsers.

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• Updated Nov 11, 2026
• JavaScript

userChromeJS / autoconfig.js and extensions

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• Updated Feb 10, 2025
• JavaScript

Firefox CSS Theme/Style for manual customization

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• Updated Nov 11, 2026
• CSS

The Firefox theme with too many options.. FF Ultima.

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• Updated Oct 27, 2026
• CSS

A collection site of Firefox userchrome themes, mostly from FirefoxCSS Reddit community.

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• Updated Nov 10, 2026
• JavaScript

FluentBird is a userChrome.css theme for Mozilla Thunderbird, that implemenets Windows 11 Fluent Design and Mica transparency materials.

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• Updated Aug 19, 2026
• CSS

🦊 Firefox user CSS theme looks similar to Chrome

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• Updated Aug 29, 2025
• SCSS

Hide contextmenu items in Firefox Photon

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• Updated May 3, 2025
• CSS

A Minimal, Cozy, Vertical Optimized Firefox Theme

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• Updated May 24, 2024
• CSS