How to Fix Browser Error MOZILLA PKIX ERROR NOT YET VALID ISSUER CERTIFICATE. Certificates used by websites which are considered to be secure (their URL begins with “ are only issued for a certain period of time. If a website presents a certificate with a validity period that doesn’t match the current value of your system’s clock, Firefox can’t verify that the connection is secure and therefore opens a “Your connection is not secure” error page.
This tutorial will apply for computers, laptops, desktops,and tablets running the Windows 10, Windows 8/8.1, Windows 7 operating systems.Works for all major computer manufactures (Dell, HP, Acer, Asus, Toshiba, Lenovo, Samsung).

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