Can't turn shields off on localhost

[Mattches]

Mentioning certificates reminded me of another user who had encountered this:

Unable to turn off Shields Up after upgrade

Thank you for your response and let me clarify: Regarding the certificate: I have already trusted the self-signed certificate and I can go to the site by accepting the warnings. I also used a localhost entry to go to the site using the common name on the certificate. This does not clear up the "not secure’ warning and according to the referenced link, it is because the certificate does not have an “alternate name” listed. Frankly this does not bother me and it does not stop me from reaching the…

I never did get to the bottom of that. What does it say when you click the padlock icon on the left-hand side of the address bar?