LibreWolf Security Hardening Guide: Maximizing Privacy and Security

Introduction

LibreWolf is a privacy-focused fork of Mozilla Firefox designed to provide stronger security and privacy protections out of the box. It removes telemetry, enhances tracking protection, and includes numerous hardening measures that would normally require manual configuration in Firefox.

This guide explains how to maximize LibreWolf’s security while maintaining reasonable usability.

Why Choose LibreWolf?

LibreWolf includes:

• No telemetry or data collection
• Enhanced Tracking Protection enabled by default
• Fingerprinting resistance
• Strict HTTPS settings
• Secure DNS support
• Hardened browser configuration
• Privacy-focused default settings

For many users, LibreWolf provides one of the best balances between security, privacy, and usability.

1. Keep LibreWolf Updated

The most important security measure is keeping your browser current.

Benefits:

• Security vulnerability patches
• Updated web standards
• Protection against newly discovered exploits
• Improved privacy defenses

Check for updates regularly and enable automatic updates if available on your platform.

2. Enable HTTPS-Only Mode

Navigate to:

Settings → Privacy & Security → HTTPS-Only Mode

Select:

Enable HTTPS-Only Mode in all windows

Benefits:

• Prevents accidental connections to insecure HTTP sites
• Protects against network interception attacks
• Reduces man-in-the-middle risks

3. Use Secure DNS

Navigate to:

Settings → Privacy & Security → DNS over HTTPS

Recommended providers:

• Cloudflare
• Quad9
• NextDNS

Quad9 is particularly attractive because it blocks many malicious domains automatically.

Benefits:

• Encrypts DNS requests
• Prevents ISP DNS monitoring
• Improves resistance against DNS spoofing

4. Strengthen Tracking Protection

Navigate to:

Settings → Privacy & Security

Set Enhanced Tracking Protection to:

Strict

Blocks:

• Cross-site trackers
• Cryptominers
• Fingerprinters
• Social media tracking scripts

Tradeoff:

Some websites may require exceptions.

5. Install Essential Security Extensions

Avoid installing dozens of extensions. Every extension increases attack surface.

Recommended:

uBlock Origin

Blocks:

• Ads
• Malicious domains
• Tracking scripts

Recommended filter lists:

• EasyList
• EasyPrivacy
• OISD
• Malware Domains

Bitwarden

Secure password management with:

• Strong password generation
• Password auditing
• Cross-device synchronization

ClearURLs

Removes tracking parameters from links.

Example:

https://example.com?utm_source=tracking

becomes

https://example.com

6. Use Strong Container Isolation

Install Firefox Multi-Account Containers.

Create containers for:

• Banking
• Shopping
• Social media
• Email
• Development

Benefits:

• Limits cross-site tracking
• Reduces account contamination
• Improves compartmentalization

7. Enable Total Cookie Protection

LibreWolf generally enables strong cookie isolation by default.

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Verify under:

Privacy & Security

Benefits:

• Each site gets its own cookie jar
• Prevents cross-site tracking
• Reduces advertising profiling

8. Disable WebRTC Leaks

WebRTC can expose IP addresses.

In LibreWolf:

Search for WebRTC settings in preferences.

Recommended:

• Disable WebRTC if unused
• Or route traffic through a trusted VPN

Benefits:

• Prevents IP leakage
• Improves anonymity

9. Use a VPN

A VPN does not make you anonymous, but it can improve privacy.

Benefits:

• Masks IP address from websites
• Protects traffic on public Wi-Fi
• Reduces ISP visibility

Choose providers with:

• Independent audits
• No-logs policies
• Strong encryption

10. Harden Your Operating System

Browser security depends on OS security.

Recommendations:

Linux

• Keep packages updated
• Use full-disk encryption
• Enable firewall

Windows

• Enable BitLocker
• Enable Microsoft Defender
• Use standard user accounts

macOS

• Enable FileVault
• Enable Gatekeeper
• Install updates promptly

11. Practice Safe Browsing

Even a hardened browser cannot protect against every threat.

Avoid:

• Pirated software
• Unknown downloads
• Suspicious email attachments
• Fake login pages

Verify:

• Website URLs
• TLS certificates
• Download sources

12. Advanced Hardening

For advanced users:

Disable JavaScript Selectively

Using uBlock Origin’s advanced mode or script blockers can dramatically reduce attack surface.

Use Separate Browser Profiles

Create profiles for:

• Banking
• Daily browsing
• Development
• Research

Sandbox the Browser

Linux:

• Firejail
• Bubblewrap

Windows:

• Windows Sandbox
• Application Guard

Benefits:

• Limits damage from browser exploits

Example “Maximum Security” Setup

Operating System:

• Updated Linux distribution

Browser:

• LibreWolf

Extensions:

• uBlock Origin
• Bitwarden
• ClearURLs

Network:

• Quad9 DNS
• Trusted VPN

Settings:

• HTTPS-Only Mode
• Strict Tracking Protection
• Cookie Isolation
• WebRTC Disabled

Result:
A highly secure browsing environment with strong protection against tracking, malware, fingerprinting, and common web-based attacks.

LibreWolf is already one of the most hardened mainstream browsers available. The biggest gains come from keeping it updated, using uBlock Origin, enabling HTTPS-Only Mode, using secure DNS, and practicing good security hygiene. Beyond that, compartmentalization, containerization, and operating system hardening can provide defense-in-depth against more advanced threats.