Gitlab Monolith Container Certificate contains the same serial number as another certificate

I’m running docker.io/gitlab/gitlab-ce 12.7.2-ce.0 in docker 1.13.1 in a Centos 7.7 Virtualbox VM.
When connecting with latest Firefox I get an error:

An error occurred during a connection to vagrant-gitlab:8443. You are attempting to import a cert with the same issuer/serial as an existing cert, but that is not the same cert. I did not store any exeption in Firefox, nor will it let me add one for this local URL.

Error code: SEC_ERROR_REUSED_ISSUER_AND_SERIAL

The help page has no answer I can use.
https://support.mozilla.org/en-US/kb/Certificate-contains-the-same-serial-number-as-another-certificate

Is this a known problem, and has it been fixed?
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