your connection is not secure on firefox-Error code: SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE

your connection is not secure on firefox-Error code: EC_ERROR_EXPIRED_ISSUER_CERTIFICATE

your connection is not secure on firefox-Error code: SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE

This issue is related to date and time setting. 

The date of the system is set to some 

wrong time so we will see this warning

step 1: Click on right corner as shown below

Step 2: click on "change date and time setting"

Step 3: click on date and timezone and update it the present time

your connection is not secure firefox,

firefox error code: sec_error_unknown_issuer,

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