IronFox is Firefox ESR-based, completely de-Googled, has zero telemetry, and comes pre-hardened for privacy.

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.

Version IronFox v140.0.4 released, .apk available for download here.

More discussion about the browser here.

Unfortunately, not available in FDroid yet.