IronFox

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IronFox is a fork of Divested Computing Group's Mull Browser, based on Mozilla Firefox. Our goal is to continue the legacy of Mull by providing a free and open source, privacy and security-oriented web browser for daily use.

[!TIP] Find a bug? Encounter an annoying problem? Have a tip, idea, or suggestion you'd like to share? Please file any issues, bug reports, and suggestions over at our unified issue tracker!

[!IMPORTANT] All users are HIGHLY recommended to take a look at our documentation, ESPECIALLY the Limitations and Frequently Asked Questions pages!

Features

IronFox hardens Firefox for Android and removes parts of it that work against privacy. Highlights:

• Privacy: clears history, cache, downloads and open tabs on exit, uses DNS over HTTPS (Quad9, max protection), enables Strict Enhanced Tracking Protection, bundles uBlock Origin, and blocks geolocation, local network and external-app prompts by default.
• Fingerprinting resistance: enables Suspected Fingerprinters Protection, defaults to the light theme, and requests English (en-US) pages by default.
• Security: HTTPS-Only Mode, per-site process isolation (Fission), memory tagging on supported devices, a hardened PDF viewer, and JavaScript JIT, add-on installation, autofill and the built-in password manager off by default.
• User control: toggles for JavaScript, WebGL, WebRTC, WebAssembly, SVG, IPv6 and the referer policy, plus about:config.
• Less Mozilla: no sponsored tiles, Firefox Suggest, surveys or crash reporting, and no Adjust, Sentry or Google Play libraries. Push notifications use UnifiedPush.
• Sensible defaults: DuckDuckGo as the default search engine, and media autoplay and web notifications blocked.

See the full list on the features page, and read the limitations to understand what IronFox can and can't protect against.

Install and Verify

For details and step-by-step instructions on how to install IronFox, see our Download page.

IronFox supports the same minimum Android version as Firefox for Android, on arm64, arm and x86_64 devices, including Android TV and Fire TV.

Release builds are the stable channel. Nightly builds come from CI, use a different package ID, and differ slightly in branding and developer options. See Nightly vs. Release.

The changelog has the notes for the latest release. Notes for every release are on the releases page.

Package ID: org.ironfoxoss.ironfox

Package ID (Nightly): org.ironfoxoss.ironfox.nightly

SHA-256 Hash of Signing Certificate:

C5:E2:91:B5:A5:71:F9:C8:CD:9A:97:99:C2:C9:4E:02:EC:97:03:94:88:93:F2:CA:75:6D:67:B9:42:04:F9:04

Get Involved

Want to join the IronFox Community? We'd love to see you over on Matrix (Recommended) and Discord!

Report bugs and suggestions on the issue tracker. Code and merge requests go to GitLab, which is IronFox's home. The repository is also mirrored to Codeberg and GitHub.

Bug reports, translations, and code changes are welcome. See CONTRIBUTING.md for how to build IronFox, run the linters, and submit changes, and docs/ARCHITECTURE.md for a map of the repository.

Licensing

The scripts are licensed under the GNU Affero General Public License, version 3 or later. Patches follow the license of the files they modify. See LICENSES.md for details and attributions.

Notices

• Mozilla Firefox is a trademark of The Mozilla Foundation.
• This is not an officially supported Mozilla product. IronFox is in no way affiliated with Mozilla.
• IronFox is not sponsored or endorsed by Mozilla.
• IronFox is not associated with DivestOS, Divested Computing Group, or Mull in any manner.
• Firefox source code is available at https://github.com/mozilla-firefox/firefox.