PhantomFox user.js

A minimalist but powerful user.js configuration for Firefox.
Designed as a lightweight alternative to Arkenfox and Betterfox, focused on privacy, security, and performance without breaking usability.

PhantomFox disables telemetry, Firefox Sync, tracking features, and adds several performance optimizations — while keeping important protections (like Safe Browsing) enabled.

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✨ Features

• Works on Linux, macOS, and Windows
• Privacy-first: disables telemetry, Sync, WebRTC leaks, geolocation, battery API, and more
• Performance tweaks: hardware acceleration, optimized connections, WebRender
• Minimal startup: Firefox opens with about:blank for speed and focus
• Security: Safe Browsing (malware & phishing protection) stays enabled
• Easy to update with a single terminal command

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❤️ PhantomFox supports all Firefox-based browsers

Yes, you heard right, PhantomFox user.js works on all Firefox-based browsers! It works correctly on all Firefox-based browsers such as Zen, LibreWolf, and WaterFox. My goal here is to achieve a much more user-friendly experience. You can also apply the following download steps to your own Firefox-based browser.

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📥 Installation

1. Download the user.js

Clone this repository or just download the user.js file:

git clone https://github.com/KeremMKD/PhantomFox.git
cd PhantomFox

Or download manually: user.js

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2. Locate Your Firefox Profile

Find your profile folder:

• Linux: ~/.mozilla/firefox/xxxxxxxx.default-release/
• macOS: ~/Library/Application Support/Firefox/Profiles/xxxxxxxx.default-release/
• Windows: %APPDATA%\Mozilla\Firefox\Profiles\xxxxxxxx.default-release\

Replace xxxxxxxx.default-release with your actual profile name.

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3. Copy user.js into Profile

cp user.js ~/.mozilla/firefox/xxxxxxxx.default-release/

For macOS:

cp user.js ~/Library/Application\ Support/Firefox/Profiles/xxxxxxxx.default-release/

For Windows (PowerShell):

copy user.js "$env:APPDATA\Mozilla\Firefox\Profiles\xxxxxxxx.default-release\"

Restart Firefox. Done ✅

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🔄 Updating

To update PhantomFox, just run:

cd PhantomFox
git pull
cp user.js <your-firefox-profile-folder>/

You always stay on the latest version with one command.

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📌 Why PhantomFox?

Unlike Arkenfox (huge, complex configs) and Betterfox (performance-heavy tweaks), PhantomFox is simple:

• Not hundreds of prefs, just the essentials
• Focused on real-world privacy & security
• Works out of the box — no constant tweaking required

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📝 Changelog

See CHANGELOG.md for version history.

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📜 License

This project is licensed under the GNU General Public License v3.0.
See the LICENSE file for details.