Notes 
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
Rate IronFox: No account needed
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 115
Strong website security headers
Graded by Mozilla HTTP Observatory, tested 1d 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
Brave Fast, cross-platform Chromium browser that blocks ads and trackers by default. A complete package out of the box, suitable for beginners or when setup time matters.
Firefox Reliable, fast and privacy-friendly. Harden it with add-ons, enable DNS-over-HTTPS, and sync across all your devices.
Firefox Focus Dedicated mobile privacy browser with automatic tracking protection and ad blocking. With Focus, your pages load faster and your data stays private.
DuckDuckGo Privacy-focused search engine and mobile browser that blocks trackers and searches without profiling you. Partially open source, based in the US.
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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