What is DNS over HTTPS (DoH)?
Chrome had it, now Firefox. Be aware:
DNS over HTTPS is specifically designed to address the fundamental privacy and security limitations of DNS by leveraging the HTTPS protocol your browser already uses when connecting to a secure website. With DoH enabled, DNS requests are sent via encrypted HTTPS, securing the connection request between you and your verified DNS provider
When these DNS requests are DoH encrypted your network logs no longer provide visibility into what DNS requests are occurring and by which device.
So, starting January 1st. 2020, Webroot DNS Protection will automatically categorize all DoH and DNS over TLS (DoT) domain requests under our Proxy Avoidance and Anonymizers URL category. By default, all DoH and DoT requests will automatically blocked as a security risk.