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mobile_user.js
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user.js file for configuring Firefox Fenix Nightly, Iceraven Fennec and Mull privacy, security and anti-fingerprinting.
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README.md

user.js | Firefox Fenix Nightly, Iceraven, Fennec F-Droid or Icecatmobile

The user.js file is used to configure Firefox for android in the safest and fastest way possible. There are 2 versions:

  • Default user.js for average users.
  • Another one with less connections as possible, meaning there are not automatic addons updates. You'll have to uninstall and reinstall them (not recommended)

Goals:

  • enhance security and privacy
  • improve performance
  • better fingerprint possible
  • reduce automatic connections

Compatible browsers:

This user.js has been designed for mobile purposes and you can use it on these browsers:

How to install:

ROOT METHOD 1 (file manager)

I would like to suggest the use of Simple File Manager Pro, Material Files or TWRP File Manager before proceed.

  • Download and install Firefox Fenix Nightly, Iceraven, Fennec F-Droid or Icecatmobile from their official websites (see above)

  • Start the browser for the first time (offline mode/no data connections) and wait about 5 sec.

  • Close it.

  • Clone or download zip file and extract it

  • Locate browser's installation directory similar to this:

    ✳️ Firefox Fenix Nightly data/data/org.mozilla.fenix/files/mozilla/[xxxxxxx].default

    ✳️ Iceraven data/data/io.github.forkmaintainers.iceraven/files/mozilla/[xxxxxxx].default

    ✳️ Fennec F-Droid data/data/org.mozilla.fennec_froid/files/mozilla/[xxxxxxx].default

    ✳️ Icecatmobile data/data/org.gnu.icecat/files/mozilla/[xxxxxxx].default

  • Copy the extracted user.js file to the above installation directory.

  • Delete prefs.js file inside the above directory

  • Start the browser and test if user.js was applied : browse to about:config (put it in search bar) and look if config.applied is true.

If this doesn't work I suggest you to use the ROOT METHOD 2 below.

ROOT METHOD 2 (app)

  • Download and install the browser from their official websites.

  • Download and install User.js Updater

  • Start the browser for the first time (offline mode/no data connections) and wait about 5 sec.

  • Close it.

  • Open User.js Updater app and grant storage permission.

  • Choose Custom and write the following:

    https://git.nixnet.xyz/Narsil/mobile_user.js/src/branch/master/user.js

  • Tap UPDATE at the bottom and grant root permission.

  • Start the browser and test if user.js was applied : browse to about:config (put it in search bar) and look if config.applied is true.

  • AFWall+ USERS: You can disable Use Download Manager option into Settings and enable data connection just to the app itself.

NON ROOT METHOD

Have a look at Non-Rooted guide from Arkenfox:

Firefox Android

Considerations

Some automatic connections could not be blocked so you will have to add them to your host list (root required)

firefox.settings.services.mozilla.com

safebrowsing.googleapis.com (safebrowsing is active and not changeable)

Thanks

I really thank the following authors:

License

GNU General Public License v3.0.

See LICENSE for more details.