vronit5 said

this problem is making me nuts. cant open sites likes netflix,amazon. it doesnt even recognize mozilla site.

Hello vronit5,

That must be very frustrating .....

Please take a deep breath and go over this article (it's a lot to
read .... ) :

https://support.mozilla.org/en-US/kb/error-codes-secure-websites

Does that help  ?

What error message do you see on the error page? Is this SEC_ERROR_UNKNOWN_ISSUER or another message?

You can check if there is more detail available about the issuer of the certificate.

• click the "Advanced" button show more detail
• click the blue error text (SEC_ERROR_UNKNOWN_ISSUER) to show the certificate chain
• click "Copy text to clipboard" and paste the base64 certificate chain text in a reply

If clicking the blue error text doesn't provide the certificate chain then try these steps to inspect the certificate.

• open the Servers tab in the Certificate Manager
  • Options/Preferences -> Privacy & Security
    Certificates: View Certificates -> Servers: "Add Exception"
• paste the URL of the website (https://xxx.xxx) in it's Location field

Let Firefox retrieve the certificate -> "Get Certificate"

• click the "View" button and inspect the certificate

You can see detail like the issuer of the certificate and intermediate certificates in the Details tab.