Firefox showing security warning after update

 

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Symptom : After updating FireFox version to 58, you may encounter the following error with several sites including YouTube and Google.

 

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The owner of www.youtube.com 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.

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SEC_ERROR_UNKNOWN_ISSUER

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https://www.youtube.com/

Peer’s Certificate issuer is not recognized.

HTTP Strict Transport Security: true
HTTP Public Key Pinning: true

Certificate chain:

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Solution :

Step 1 : Open a new tab in firefox and , type or paste about:config in the address bar and press Enter/Return.

Step2 : Click the button promising to be careful or accepting the risk.

Step 3 :  In the search box above the list, type or paste security.enterprise_roots.enabled

Step 4 : Double-click the security.enterprise_roots.enabled preference to switch the value from false to true

DONE !!! Issue Resolved !!!

 

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