Cannot create Certificate Exception
On my home network, I run a Ubiquiti UniFi Network (Security Gateway, Switch and WiFi Access Points). I access the administrative functions with UniFi Controller software which accesses those functions via https://localhost:8443. The Gateway Roouter itself is at 10.0.0.1:443, but cannot be administered at this address.
When I try to access the website, I get the standard Firefox invalid security certificate warning as the certificate is self-signed (image 1). Once I Accept the Risk and Continue, I can successfully log into the site. But once I quit my Firefox session, whenever I launch Firefox and try to access the site, I am again given the same invalid security certificate.
Previously, I was able to create a certificate exception which bypassed that warning, but no longer.
When I go into Firefox's Preferences : Privacy & Security : Certificates : View Certificates page, I can see a Temporary exception (image 2), which presumably only lasts for the current session. I try to Add Exception, enter my localhost port number' (image 3), then click on Get Certificate. It tells me that I have valid, verified identification. There is no need to add an exception (image 4).
And yet, every time I visit the localhost website, I am prompted with the warning. Any ideas of what I might do avoid this warning every time I want to access it? Is there some way to allow this device (or even ALL devices) on my home network to be trusted?
Also attached are images of my UniFi Certificate.
Thank you for any assistance.