Display KEX algorithm in a page security information

[netchv]

When asking for a page security information (desktop Firefox  : 🔒 in URL bar => "Connection secure" => "More information"), Firefox displays the TLS version and the cipher used in the established TLS connection. With the last years issues with quantum computing apprehension and post-quantum cryptography, this is getting not more crucial than the KEX method used during a connection establishment: is it pre-PQ one (most likely, ECDH), PQ algorithm only, or a combined one (as preferred now). The applied algorithm is shown by some sites, for example, https://pq.cloudflareresearch.com/, but only for their own site. There could be sites with older software, suspicious for issues like session recording for later decryption.

My request is to extend the page information with the KEX algorithm utilized during the secure connection establishment. Also, some more information might be useful, as a protocol used in the connection (HTTP/1, 2, QUIC, etc.)

[Jon]

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