Public Key Pinning
Please add support for the Public-Key-Pins HTTP header so that we can pin public keys.
Paul Buonopane commented
https://developer.microsoft.com/en-us/microsoft-edge/platform/status/publickeypinningextensionforhttp/ erroneously indicates that Firefox doesn't support HPKP; however, it's been supported for a long time.
This feature is already supported in Mozilla Firefox 35