Customize Firefox with Phoenix, a set of configurations and modifications focused on privacy, security, and usability.
arkenfox
Harden Firefox privacy and anti-tracking settings with the arkenfox user.js configuration template.
About arkenfox
arkenfox provides a user.js template, a configuration file that controls Firefox settings, with preferences focused on privacy, security, anti-tracking and reduced fingerprinting. It is made specifically for desktop Firefox.
Some loss of functionality and breakage is expected. The project states it should not be used as-is in other Gecko-based browsers, and does not recommend connecting over Tor with Firefox, advising Tor Browser instead for that use.
Key features
- User.js template that controls Firefox settings through configuration
- Privacy settings intended to reduce tracking
- Security settings for hardened Firefox configuration
- Settings intended to reduce fingerprinting
- Includes prefsCleaner.sh and prefsCleaner.bat files
- Includes updater.sh and updater.bat files
Best for: Desktop Firefox users who want a settings template to reduce tracking and fingerprinting.
Good for
- Open source repository with MIT license
- Aims to minimize loss of functionality while applying settings
Watch out for
- Some loss of functionality and breakage will happen
- Made specifically for desktop Firefox, not other Gecko-based browsers
- Not recommended for connecting over Tor on Firefox
arkenfox at a glance
- Website
- github.com/arkenfox/user.js
- Category
- Privacy & Security › Private Browsers & Search
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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arkenfox FAQ
What is a user.js file?
A configuration file that can control Firefox settings.
Can I use arkenfox user.js over Tor on Firefox?
No. The project does not recommend connecting over Tor on Firefox and advises using Tor Browser for that threat model or for accessing hidden services.
Can I use it in other Gecko-based browsers?
It is made specifically for desktop Firefox. Using it as-is in other Gecko-based browsers can be counterproductive, especially in Tor Browser.
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