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:

• Firefox Fenix Nightly for Android - Mozilla-mobile
• Iceraven browser - Forks maintainers
• Fennec F-Droid - F-Droid
• Icecatmobile - F-Droid (out of date)

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

Thanks:

I really thank the following authors:

• [Quindecim] (https://git.nixnet.xyz/quindecim/mobile_user.js) - Without him, this project could not be possible.
• [Arkenfox] (https://github.com/arkenfox/user.js) - Updates.
• [v1nc] (https://github.com/v1nc/) - For his user.js updater app

License

GNU General Public License v3.0.

See LICENSE for more details.