SEC_ERROR_EXPIRED_CERTIFICATE in FIrefox on Mac only

I’m getting a SEC_ERROR_EXPIRED_CERTIFICATE error from Firefox on macOS when trying to go to https://www.foodtalkcentral.com/latest, says the certificate expired yesterday. No problem with Firefox on Windows or Chrome on either OS.

Looks more like a local Firefox issue than a Discourse issue then.
Did you try clearing some settings/cache, or reinstalling/resetting the browser?

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