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Firefox privacy, security and anti-tracking: a comprehensive user.js template for configuration and hardening

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📃 My changes

Until I get the time to write every change I make down, you should just look at the commit history from me.

⬇️ Installation/Usage

  1. Install Firefox
  2. Click the green <> Code-button and clone the repo or download as ZIP
  3. Find your Firefox profile directory:
    In Firefox: about:support -> Profile Folder -> Open Folder and close Firefox
  4. Make your changes to the user-overrides.js-file
  5. Copy user-overrides.js, user.js files to your profile folder
  6. Copy over the "updater" and "prefsCleaner":
    Windows: Copy updater.bat, prefsCleaner.bat to your profile folder
    Linux: Copy updater.sh, prefsCleaner.sh to your profile folder
  7. Run the "updater" and "prefsCleaner".

🦊 Downloading Firefox (the right way)

The Firefox installer from Mozilla's official webpage contains a unique download token.1 You should therefore get the installer from your package-manager, or their FTP repository:

📖 Troubleshooting

Twitch (or other websites) "Your browser is not currently supported. Please use a recommended browser or learn more here."

You might not be able to log in to Twitch using this config since it uses RFP (Resist Fingerprinting). Use one of the following options:

Option 1 (Recommended, although a little annoying):

u/gdmr458's Guide

Option 2 (Works great, but requires a seperate window for Twitch):

Go to about:profiles
Click Create a New Profile
Click Launch profile in new browser

A new Firefox window should appear with a default Firefox. Use this only for websites you need, and you should be good to go. No need to configure it.


🟪 user.js

A user.js is a configuration file that can control Firefox settings - for a more technical breakdown and explanation, you can read more in the wiki

🟩 the arkenfox user.js

License: MIT

The arkenfox user.js is a template which aims to provide as much privacy and enhanced security as possible, and to reduce tracking and fingerprinting as much as possible - while minimizing any loss of functionality and breakage (but it will happen).

Everyone, experts included, should at least read the wiki, as it contains important information regarding a few user.js settings. There is also an interactive current release, thanks to icpantsparti2.

Note that we do not recommend connecting over Tor on Firefox. Use the Tor Browser if your threat model calls for it, or for accessing hidden services.

Also be aware that the arkenfox user.js is made specifically for desktop Firefox. Using it as-is in other Gecko-based browsers can be counterproductive, especially in the Tor Browser.

🟧 sitemap

🟥 acknowledgments

Literally thousands of sources, references and suggestions. Many thanks, and much appreciated.

Footnotes

  1. PrivacyGuides.org

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