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How can i recover access to all the websites i used to go with firefox

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I get this message to any website i try, after i refresh firefox.

The owner of www.google.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.

I get this message to any website i try, after i refresh firefox. The owner of www.google.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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Hi, can you click the Advanced button ? If so do so.

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https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER

It is possibly Avast or AVG which Avast bought. If your running any of the listed Security Software please see their Community Forum for a work around.