I am not the anonymous poster for which you replied to. Today, am getting the pop-up and unable to edit and needed to log out. It can be annoying getting pop-up pages with the following text when accessing https://perlmonks.org or https://www.perlmonks.org. It works sometimes without issues, but not always.
perlmonks.org uses an invalid security certificate.
The certificate is only valid for the following names:
Error code: SSL_ERROR_BAD_CERT_DOMAIN
See also, google-chrome-pushes-for-user-protection-with-not-secure-label.