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Firefox Privacy Settings

Go to Settings.

General

Files and Applications

Downloads >
- Always ask you where to save files: On

Browsing

Recommend extensions as you browse: Off
Recommend features as you browse: Off

Home

Firefox Home Content

Shortcuts > Sponsored shortcuts: Off
Recommended stories: Off

Search

Default Search Engine

DuckDuckGo or add any other privacy respecting search engine.

Search Suggestions

Provide search suggestions: Off

Privacy & Security

Enhanced Tracking Protection

Strict

Website Privacy Preferences

Tell websites not to sell or share my data: On
Send websites a “Do Not Track” request: Off

Passwords

Ask to save passwords: Off

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

Permissions

Warn you when websites try to install add-ons: On

Firefox Data Collection and Use

Turn off everything

Security

Deceptive Content and Dangerous Software Protection >
- Enable everything
Certificates >
- Query OCSP responder servers to confirm the current validity of certificates: On

HTTPS-Only Mode

Enable HTTPS-Only Mode in all windows

DNS over HTTPS

Enable secure DNS using >
- Max Protection
- Choose provider: NextDNS/Cloudflare or select Custom and provide URL for other secure DNS from this list.
  
  Example: For Quad9, enter https://dns.quad9.net/dns-query

Further Hardening

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