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Firefox Mobile Privacy Settings

Following settings also apply to Fennec, except the Data collection section.

Go to Settings.

Search

Search engines

Default search engine: DuckDuckGo or add any other privacy respecting search engine.

Suggestions from search engine

Show search suggestions: Off

Address bar preferences

Show clipboard suggestions: Off
Autocomplete URLs: Off

Homepage

Sponsored shortcuts: Off
Thought-provoking stories: Off (Does not apply to Fennec)

Logins and Passwords

Save logins and passwords: Never save
Autofill in Firefox/Fennec: Off
Autofill in other apps: Off

NOTE: Never save passwords in browsers. Use a password manager instead. Check out recommendations, alternatives & reviews.

Autofill

Save and autofill addresses: Off
Save and autofill cards: Off

NOTE: Never save payment info or credit card details in browsers. A password manager can be used to also save payment information or card details.

Private browsing

Allow screenshots in private browsing: Off

HTTPS-Only Mode

On
Enable in all tabs

Enhanced Tracking Protection

Enhanced Tracking Protection: On
Strict
Tell websites not to share & sell data: On

Site permissions

Cross-site cookies: Blocked

Data collection

This section does not apply to Fennec

Usage and technical data: Off
Marketing data: Off
Studies: Off

Add-ons

Check recommended extensions to add

Further Hardening

For further hardening of Firefox Beta and Fennec, check out arkenfox user.js.

NOTE 1: To use user.js, place it in

Firefox Beta: /data/data/org.mozilla.firefox_beta/files/mozilla/<profile name>.default/
Fennec: /data/data/org.mozilla.fennec_fdroid/files/mozilla/<profile name>.default/

Check the permissions for pref.js already present in that path and give the same permissions to user.js

NOTE 2:

Root access is required for placing user.js in above mentioned path and changing permissions.
Users without root access can change each and every setting manually in about:config

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