Mozilla Firefox Security Certificate

I assume that someone at Eccie is aware of this. But, just in case I am in error. When I attempt to log on via Mozilla Firefox I get the following message:

"www.eccie.com uses an invalid security certificate.

The certificate expired on Thursday, March 15, 2018, 6:59 PM. The current time is Thursday, March 29, 2018, 9:34 PM.

Error code: SEC_ERROR_EXPIRED_CERTIFICATE"