IronFox is the community-maintained successor to Mull, the hardened Firefox-based browser that shipped with DivestOS before that project was discontinued. It strips telemetry and Mozilla data-collection hooks from Firefox for Android and ships with content blocking enabled by default.
Reviewed by Marco Wollank
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Threat level
Hardened
A hardened pick. Worth the effort once you have chosen to shrink your footprint on purpose. Enough for most people. Threat levels
Our take
If you used Mull and want to stay on a hardened Firefox for Android, IronFox is the natural continuation. The hardening patches and privacy-focused defaults give it a meaningful edge over vanilla Firefox for Android, and the open license means the community can audit and maintain it independently. The main catch is a small developer base: a project this size depends on sustained volunteer effort, so watch the release cadence before committing fully. Power users and GrapheneOS or CalyxOS runners are the obvious audience; casual users may find the configuration surface more than they need.
Website at a glance
ironfoxoss.org
A+ score 110
Strong website security headers
Graded by Mozilla HTTP Observatory, tested 4d ago
Inspect this site yourself
Measures the security configuration of the tool's own website, not the privacy of the product itself. A strong tool can still score low here.
IronFox alternatives
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Firefox Focus Dedicated mobile privacy browser with automatic tracking protection and ad blocking. With Focus, your pages load faster and your data stays private.
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Cromite Open-source Chromium fork for Android with built-in ad blocking and anti-fingerprinting. The actively maintained successor to Bromite.
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