LibreWolf
Privacy-focused Firefox fork without telemetry
Quick Take: LibreWolf
LibreWolf is the best option for users who want Firefox without Mozilla's data collection and advertising partnerships. It ships with stronger privacy defaults than any other mainstream browser, includes uBlock Origin from day one, and keeps the full Firefox extension ecosystem. The tradeoffs—slightly delayed updates, no Firefox Sync by default, occasional site breakage—are minor for users who prioritize privacy. If you've ever spent 20 minutes configuring Firefox's about:config for privacy, LibreWolf pre-does all of that and more.
Best For
- •Privacy-Focused Users Who Prefer Gecko Over Chromium
- •Firefox Users Uncomfortable with Mozilla's Data Practices
- •Security Researchers Needing a Hardened Browser Baseline
What is LibreWolf?
LibreWolf is Firefox with the tracking ripped out. It's a community-maintained fork that takes Mozilla's browser, removes all telemetry, disables data collection, ships uBlock Origin pre-installed, and tightens privacy defaults to levels that would take a regular Firefox user 30 minutes of about:config tweaking to achieve. If you like Firefox's rendering engine and extension ecosystem but don't trust Mozilla's business decisions around ads, sponsored content, and data partnerships, LibreWolf is the answer. The fork stays current with the latest Firefox stable release, delivering up-to-date security and features. Updates typically arrive within 1-3 days of each upstream Firefox release, sometimes even the same day. The core browser experience—tabs, extensions, Developer Tools, PDF viewer—is identical to Firefox. What's different is everything that happens behind the scenes. LibreWolf removes Mozilla's telemetry system entirely. No usage data collection, no crash reporting (unless you opt in), no sponsored tiles on the new tab page, no Pocket integration, no Firefox Sync (disabled by default, can be re-enabled), no studies or experiments. It pre-configures privacy settings that Firefox buries in about:config: Enhanced Tracking Protection is set to strict, fingerprinting resistance is enabled, third-party cookies are blocked, WebRTC is configured to prevent IP leaks, and the referrer policy is tightened. uBlock Origin comes pre-installed in its default configuration, blocking ads and trackers from the first launch. For users who want a genuinely private browser without switching to a Chromium-based option like Brave, LibreWolf provides Firefox's engine (Gecko) with privacy defaults that respect the user instead of Mozilla's advertising partners.
Install with Homebrew
brew install --cask librewolfDeep Dive: Why a Privacy Fork of Firefox Matters
The relationship between LibreWolf and Firefox, why telemetry removal matters, and the broader implications for browser diversity.
History & Background
LibreWolf emerged from a lineage of Firefox privacy forks. Earlier projects like LibreFox (a set of privacy-focused configuration files) showed demand but were hard to maintain. LibreWolf formalized the approach: a full fork with build infrastructure, packaging for all major platforms, and a team of maintainers. It gained significant traction in 2023-2024 as Mozilla's advertising partnerships expanded and privacy-conscious users looked for alternatives that didn't involve switching to Chromium.
How It Works
LibreWolf's build process starts from Mozilla's Firefox ESR source code, applies a series of patches (removing telemetry code, disabling Pocket, adding uBlock Origin), and compiles the result for each platform. The patches are maintained in a GitLab repository and updated for each ESR release. This approach means LibreWolf inherits all of Firefox's security and rendering improvements automatically—the patches only touch privacy-related code paths.
Ecosystem & Integrations
LibreWolf benefits from Firefox's entire extension ecosystem without maintaining it. Any extension that works in Firefox works in LibreWolf. The community around LibreWolf is distinct from Firefox's—it's smaller, more privacy-focused, and less interested in features like Pocket or sponsored content. LibreWolf's documentation and community resources focus on privacy configuration, threat modeling, and explaining exactly what telemetry was removed.
Future Development
LibreWolf's roadmap tracks Firefox ESR's release schedule. When Mozilla releases a new ESR version, LibreWolf patches and ships the new version within days. The team is also exploring additional privacy hardening measures, better integration with the Tor network for specific use cases, and improved auto-update mechanisms. There are no plans for a mobile version—the team recommends Mull (Android) and Firefox Focus (iOS) for mobile privacy.
Key Features
Zero Telemetry
LibreWolf removes all of Mozilla's data collection infrastructure. No telemetry pings, no usage statistics, no crash reports (unless manually enabled), no Shield studies, no Normandy (Mozilla's remote experiment system). The browser does not phone home. This is the single biggest difference from stock Firefox, where telemetry is enabled by default and sends dozens of data types back to Mozilla's servers.
uBlock Origin Pre-Installed
LibreWolf ships with uBlock Origin already installed and configured. From the first launch, ads and trackers are blocked. uBlock Origin is widely regarded as the most effective and lightweight ad blocker available—it blocks more trackers than Brave's built-in shields while using less memory. Users can customize filter lists or disable it for specific sites, but the default configuration handles 99% of use cases.
Hardened Privacy Defaults
LibreWolf pre-configures dozens of about:config settings that privacy-conscious Firefox users normally set manually: Enhanced Tracking Protection set to Strict, resist fingerprinting enabled, third-party cookies blocked, WebRTC IP leak prevention, referrer trimming, and HTTPS-only mode. These settings are carefully tested to balance privacy with website compatibility—most sites work fine, but the occasional poorly-coded site may need an exception.
No Pocket, No Sponsored Content
Stock Firefox shows Pocket recommendations and sponsored tiles on the new tab page. LibreWolf removes both. The new tab page is blank or shows your top sites only. There are no ads, no content recommendations, and no sponsored anything. The browser is a tool, not an advertising surface.
Firefox Extension Compatibility
Because LibreWolf is a direct fork of Firefox, it's compatible with all Firefox extensions from addons.mozilla.org. Password managers (Bitwarden, 1Password), developer tools (React DevTools, Vue DevTools), accessibility tools, and every other Firefox extension works exactly as it does in Firefox. You don't give up the extension ecosystem by switching.
Based on Latest Firefox Stable
LibreWolf tracks the latest Firefox stable release for up-to-date security and features. Updates typically arrive within 1-3 days of each upstream Firefox release, sometimes even the same day. This ensures users get the newest web platform capabilities and security patches promptly while maintaining LibreWolf's privacy hardening. Unlike Firefox, LibreWolf does not have auto-update capabilities—it relies on package managers or manual updates.
Who Should Use LibreWolf?
1The Privacy-First Developer
A developer uses the web for documentation, Stack Overflow, and GitHub. They don't want their browsing tracked by Mozilla, Google, or ad networks. They install LibreWolf as their default browser. uBlock Origin blocks tracking scripts on every page, the Strict tracking protection prevents cross-site cookies, and no browsing data is sent to Mozilla. Firefox Developer Tools work identically for web development tasks.
2The Firefox Loyalist Who Doesn't Trust Mozilla
A long-time Firefox user is uncomfortable with Mozilla's increasing reliance on advertising revenue—sponsored new tab tiles, Pocket recommendations, and data partnerships. They don't want to switch to a Chromium browser (they care about engine diversity and Gecko's standards compliance). LibreWolf gives them the Firefox they fell in love with, minus the business-model compromises.
3The Security Researcher
A security professional needs a browser with hardened defaults for investigating suspicious websites. LibreWolf's fingerprinting resistance, WebRTC leak prevention, and strict referrer policy reduce information disclosure when visiting potentially malicious sites. They can further harden it with additional about:config settings, knowing that LibreWolf's baseline is already stricter than stock Firefox.
How to Install LibreWolf on Mac
LibreWolf installs via Homebrew Cask. Note: The Homebrew cask is currently deprecated (disable date: 2026-09-01) due to macOS Gatekeeper issues, though it remains installable. Updates are delivered through Homebrew—LibreWolf does not have a built-in auto-updater.
Install via Homebrew
Run `brew install --cask librewolf` in your terminal. This downloads and installs LibreWolf to your Applications folder.
Import Firefox Profile (Optional)
On first launch, LibreWolf offers to import bookmarks, history, and passwords from your existing Firefox (or Chrome/Safari) profile. This makes migration painless if you're switching from another browser.
Set as Default Browser
Go to System Settings > Desktop & Dock > Default Web Browser and select LibreWolf. Or set it from within LibreWolf's preferences.
Install Additional Extensions (Optional)
LibreWolf comes with uBlock Origin. Add any other Firefox extensions you need from addons.mozilla.org—password managers, developer tools, etc.
Pro Tips
- • If a website breaks (rare), click the shield icon in the address bar to disable Enhanced Tracking Protection for that specific site.
- • To enable Firefox Sync (disabled by default), go to about:config and set `identity.fxaccounts.enabled` to true. Your synced data is end-to-end encrypted.
- • LibreWolf uses a separate profile from Firefox, so you can run both simultaneously for comparison.
- • LibreWolf has no built-in auto-updater—rely on Homebrew for updates: brew upgrade --cask librewolf
Configuration Tips
Re-Enable Firefox Sync If Needed
LibreWolf disables Firefox Sync by default for privacy. If you want to sync bookmarks and passwords across devices, open about:config, search for `identity.fxaccounts.enabled`, and set it to `true`. Then sign in with your Firefox account in Settings. Your synced data is end-to-end encrypted.
Whitelist Sites That Break
If a site doesn't work correctly (login forms, payment processors, video players), click the shield icon in the address bar and toggle off Enhanced Tracking Protection for that site. LibreWolf remembers your exceptions. Most users accumulate 3-5 exceptions and everything else works fine.
Alternatives to LibreWolf
LibreWolf is the top privacy-focused Firefox fork, but other browsers serve different privacy needs.
Firefox
Firefox is the upstream browser that LibreWolf forks. It has faster updates, Firefox Sync by default, and Mozilla's backing. But it includes telemetry, sponsored content, and Pocket integration. If you trust Mozilla and don't mind manual privacy configuration, Firefox is fine. If you want privacy defaults out of the box, choose LibreWolf.
Brave
Brave is a Chromium-based privacy browser with built-in ad blocking, a crypto wallet, and its own search engine. It's more mainstream than LibreWolf and available on mobile. But it uses Google's Chromium engine (contributing to browser monoculture) and has its own controversies around the BAT cryptocurrency. LibreWolf is more privacy-pure and supports Gecko engine diversity.
Arc
Arc is a radically redesigned Chromium browser focused on productivity—not privacy. Its UI innovations (spaces, easels, split view) are impressive but privacy isn't the focus. If you want a modern browsing experience, choose Arc. If privacy is your priority, choose LibreWolf. They serve different needs.
Pricing
LibreWolf is free and open-source. The source code and build system are maintained on GitLab. There are no paid features, no donations required to use the software, and no commercial entity behind it. It's a community project maintained by volunteers.
Pros
- ✓All Mozilla telemetry removed—no data collection whatsoever
- ✓uBlock Origin pre-installed from first launch
- ✓Hardened privacy settings out of the box
- ✓Full Firefox extension compatibility (addons.mozilla.org)
- ✓Based on Firefox ESR—stable, security-patched
- ✓No Pocket, no sponsored content, no advertising
- ✓Gecko rendering engine (not Chromium—supports browser diversity)
- ✓Free, open-source, community-maintained
Cons
- ✗Security updates lag Firefox by 1-3 days
- ✗Firefox Sync is disabled by default (must be manually enabled)
- ✗Some websites may not work perfectly with strict privacy settings
- ✗Smaller team than Mozilla—fewer resources for bug fixes
- ✗No mobile version (LibreWolf is desktop only)
- ✗No built-in auto-updater; relies on package managers
- ✗Homebrew cask is deprecated due to macOS Gatekeeper issues
Community & Support
LibreWolf is community-maintained with development coordinated on GitLab and Matrix chat. The project has a dedicated website (librewolf.net) with documentation, FAQ, and installation guides. Discussion happens on Reddit's r/LibreWolf, Matrix rooms, and the project's GitLab issues. The community is passionate about privacy and actively tests each release for both security and compatibility. Contributors handle packaging for macOS (Homebrew), Linux (Flatpak, AppImage, distro packages), and Windows.
Frequently Asked Questions about LibreWolf
Our Verdict
LibreWolf is the best option for users who want Firefox without Mozilla's data collection and advertising partnerships. It ships with stronger privacy defaults than any other mainstream browser, includes uBlock Origin from day one, and keeps the full Firefox extension ecosystem. The tradeoffs—slightly delayed updates, no Firefox Sync by default, occasional site breakage—are minor for users who prioritize privacy. If you've ever spent 20 minutes configuring Firefox's about:config for privacy, LibreWolf pre-does all of that and more.
About the Author
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Sources & References
Fact-CheckedLast verified: May 6, 2026
- 1LibreWolf Official Website
Accessed May 6, 2026
Research queries: LibreWolf privacy browser macOS 2026