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Connection is not secure error in Firefox

Hi, My website is When I access my page from Firefox, I get the following error

"The owner of has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate. uses an invalid security certificate. The certificate is only valid for the following names:, The certificate expired on Tuesday, December 13, 2016, 2:26:00 PM. The current time is July 2, 2018, 11:39 PM. Error code: SSL_ERROR_BAD_CERT_DOMAIN"


I don't have any such errors when I access the page through Chrome. Can anyone help me resolve this issue?