after upgrade to version 15 or 16, I can't open my https sites that are signed by my CA

My CA certificate has been imported to Firefox for centuries. I have had no problems to open my secured sites. After the upgrade from 15 to 16, I started to receive warnings from unreliable connections.

The certification authority:

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

The site certificate:

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

I found what happened (I had to read what firefox said carefully before posting a support request, sorry for that):
The certificate is not reliable because it was signed with a signature algorithm that has been disabled because this algorithm is not secure.

I was able to restore by allowing this key to everything: config:
Security.enable_md5_signatures

Tags: Firefox

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