I want to get an exception for an unreliable site (which is important and fine), but he said no licence necessary so will not add exception yet still does not work because the certificate "expires" last month.

I want to access my school web-based email and did two years and suddenly, it won't work. He said that the site is not approved and validation is necessary. I click on "I understand the risks" then 'Add Exception '. It comes up with "this site offers valid, verified identification. There is no need to add an exception "." The Add Exception button is not powered. When I receive details it says "could not verify this certificate because it has expired".
How can I get Firefox to accept my Exception add?

Sorry about that, I seem to have missed that you are on a Mac.

On Mac, using Firefox > Preferences rather than Firefox/tools > Options

Tags: Firefox

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