Ubuntu: FireFox: Strange Certificates – Ask Ubuntu

Just a quick question, hope that's in the right place.

I just installed Ubuntu 18.04 LTS and found two weird certificates in Mozilla FireFox 70.0.1 (64-bit) that were ringing a bell for some reason. Can someone confirm whether these two certificates should be present during a new installation?

DigiNotar root CA.

DigiNotar PKIoverheid CA Organist – G2

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