Case Study: Mozilla achieves enhanced user privacy and encrypted DNS with Cloudflare

How Mozilla and Cloudflare are working together to help build a better Internet

Cloudflare partnered with Mozilla to address a core Internet privacy challenge: legacy DNS queries are sent in plaintext, exposing user activity even when websites themselves use HTTPS. Together they set out to develop and deploy next‑generation Internet standards that make web connections more secure and privacy‑preserving at scale.

The teams collaborated to implement TLS 1.3, QUIC, DNS over HTTPS and the Firefox Private Network, with Cloudflare running the server-side Trusted Recursive Resolver and Mozilla integrating the client in Firefox. Cloudflare’s rapid engineering, operational scale, and transparency around data use (including discarding logs) enabled encrypted DNS for Firefox users and helped advance protocols that improve security and privacy for millions — ultimately benefiting Firefox users and the broader Internet.

Mozilla

Selena Deckelmann

Vice President, Firefox Desktop