Test that static public key pins are working
It might be smart to have a test for verifying that the static PKPs in Firefox are working. It seems to me we can use https://pinning-test.badssl.com for that.
This seems especially worthwhile as the pinning woes are not over with the switch to ESR 45.4.0 yet. See: https://bugzilla.mozilla.org/show_bug.cgi?id=1303127 for more details.