Error code

Firefox SSL_ERROR_BAD_CERT_DOMAIN

FIREFOXSSL_ERROR_BAD_CERT_DOMAIN
Browser Error Code· An error code shown in a web browser when a page fails to load.

What it means

The certificate is valid but was issued for a different hostname.

How to fix it

  1. Check the URL is correct.
  2. Contact the site administrator to obtain a certificate that covers the domain being visited.
  3. Do not create an exception for this on public sites.

Not affiliated with Firefox. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.