Fennec - Firefox build with some proprietary stiff removed; repo
IronFox - Firefox fork (forked from Mull) with a bunch of hardening changes (notably resistFingerprinting enabled); repo
IronFox is more ambitious, which means higher maintenance load and more likely to fall behind. Fennec is much simpler, so less likely to fall behind, but also doesn’t change much from Firefox.
resistFingerprintingenabled); repoIronFox is more ambitious, which means higher maintenance load and more likely to fall behind. Fennec is much simpler, so less likely to fall behind, but also doesn’t change much from Firefox.