RFE: Possibility for grading quality of TLS connection

[hardfalcon]

SSLeuth offered a simple grading of the TLS connections quality, based upon factors like "strength of the symmetric encryption", "strength of the key exchange", "strength of the MAC/AEAD", "forward secrecy", "extended validation", "certificate status", etc, where the wheight for every single factor could be configured.

A similar feature would be nice to have, perhaps even rendering the grading directly onto the extension's icon in the URL bar.