Firefox vs LibreWolf vs Tor Browser: Choosing the Right Privacy Tool

Three Firefox-based browsers with different privacy postures. Here's an honest breakdown of what each protects against and when to choose each.

The Three Browsers

Firefox: Mozilla's browser. Good defaults, configurable, mainstream ecosystem.

LibreWolf: A Firefox fork with hardened defaults. Strips telemetry, applies privacy-focused about:config settings, ships with uBlock Origin installed. Maintained by a small team.

Tor Browser: Firefox configured to route all traffic through the Tor anonymity network. Specifically designed to prevent browser fingerprinting and hide IP addresses.

What Each Protects Against

Firefox (Stock)

With Strict Enhanced Tracking Protection and the settings from my privacy guide:

✅ Cross-site tracking cookies

✅ Known tracker scripts (per ETP list)

✅ DNS query visibility (with DoH enabled)

✅ Unencrypted HTTP connections (with HTTPS-Only Mode)

✅ Some fingerprinting (in Strict mode)

❌ Mozilla telemetry (by default)

❌ IP address visibility to websites

❌ Full fingerprint uniqueness

❌ WebRTC IP leaks (without about:config change)

LibreWolf

Starts with Firefox, adds:

✅ Everything Firefox protects + hardened about:config

✅ Telemetry removed

✅ uBlock Origin pre-installed

✅ Resist Fingerprinting enabled (more aggressively than Firefox default)

✅ Clearnet cookies cleared on close (if you configure it)

❌ IP address visibility to websites

❌ Some sites may break due to hardened settings

❌ Updates lag slightly behind Firefox Stable

Tradeoff: LibreWolf prioritizes privacy over convenience. Some sites have issues with ResistFingerprinting or cookie policies. You'll fix these in settings or by overriding for specific sites.

Tor Browser

Tor Browser adds:

✅ Everything LibreWolf/Firefox + IP masking via Tor routing

✅ Near-identical fingerprint to all other Tor Browser users

✅ New identity per window (clear cookies, new circuit)

✅ Built-in clearnet isolation

❌ Slow (traffic routes through multiple Tor relays)

❌ Many sites block Tor exit nodes

❌ Can't use most Firefox extensions (breaks fingerprint uniformity)

❌ Incompatible with user-specific accounts (if logging in, you're identifiable)

Key point about Tor Browser: It only provides anonymity against IP-level tracking. If you log into an account, you're identified by that account. Tor doesn't make you anonymous if you authenticate.

When to Use Each

Use Firefox (hardened) for:

• Daily browsing with good privacy
• You need extension support (uBlock, containers, your dev tools)
• You want to stay logged into accounts
• Performance matters

Use LibreWolf for:

• You want hardened Firefox defaults without manual about:config work
• You're privacy-conscious but still need some web functionality
• You trust a community fork to maintain sensible defaults
• You want telemetry removed at the browser level

Use Tor Browser for:

• You need to hide your IP from websites (journalism, sensitive research, whistleblowing)
• You need to bypass regional blocks or network monitoring
• You want anti-fingerprinting as strong as currently available
• You accept the slowness and site breakage

Don't use Tor Browser for:

• Logging into personal accounts (nullifies anonymity)
• General daily browsing (it's too slow)
• Video streaming (not designed for it)

LibreWolf Installation and Setup

LibreWolf installs as a separate browser from firefoxes.org. It uses its own profile system so it doesn't interfere with regular Firefox.

On Linux: available via Flatpak, AppImage, or package managers on some distros.

On Windows/macOS: installer download from librewolf.net.

Profile migration from Firefox: copy your Firefox profile folder into LibreWolf's profile directory (adjust the path). Not perfect, but preserves bookmarks and passwords.

Extensions Across Browsers

Extensions that work in all three:

• uBlock Origin
• Multi-Account Containers
• Bitwarden

Extensions that work in Firefox and LibreWolf but not Tor Browser:

• Most browser extensions (Tor restricts them to preserve fingerprint uniformity)

The exception: Tor Browser allows uBlock Origin and a few others if you need them, but enabling non-standard extensions increases fingerprint uniqueness, which is counterproductive to Tor's goals.

The Fingerprint Question

Browser fingerprinting uses your browser's characteristics (installed fonts, screen resolution, timezone, JavaScript engine quirks, canvas rendering) to identify you without cookies.

• Firefox: Partially resists in Strict mode
• LibreWolf: Actively resists with ResistFingerprinting, reports fake data
• Tor Browser: Makes you look identical to all other Tor Browser users — strongest fingerprint protection

For most people, fingerprinting is a secondary concern compared to cross-site tracking cookies. For high-risk individuals, Tor Browser's approach is more effective.

Practical recommendation: hardened Firefox for daily use, Tor Browser for specific sensitive activities. LibreWolf is a good middle ground if you want hardened-by-default without running Tor.