Impressive. I know Firefox uses NSS (its own TLS library) and not OpenSSL, but this article makes me wonder if Mozilla would consider using rustls in FF as Rust handles more and more of the FF code. Maybe it says something that NSS has few users apart from FF despite the obvious advantage of being maintained by a major organization.

Interestingly, the crypto code in rustls is by ring, a Rust crypto library. According to the ring github page, "Most of the C and assembly language code in ring comes from BoringSSL, and BoringSSL is derived from OpenSSL."