[tveita]

ChaCha20-Poly1305 is a symmetric cipher, used for encrypting your traffic. X25519 is an key exchange protocol using asymmetric cryptography, and is used in during connection setup to establish keys for the symmetric cipher.

X25519 would appear under "Key exchange" and ChaCha20-poly1305 under "Cipher Suite"

With Chromium I just get ECDHE_RSA and AES_128_GCM, anyway.