eMudhra explanation : https://bugzilla.mozilla.org/show_bug.cgi?id=2083449#c11
Kind of hard to understand how a bug would have generated a second pair of key so bad, and how would human would have ended up using them. Never attribute to malice what can be attributed to stupidity, but sometimes you wonder.
And an equal amount of stupidity in the whole ecosystem, apparently there are no "unit-tests" for trivial failure modes, like 8 bits of entropy, before adding a CA to the trusted list.
What next, googling the public key finds a 2 year old pastebin with the private key?
Any sufficiently advanced malice is indistinguishable from stupidity.