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In Bitdefender Antivirus Free it's not possible to control this setting. In older versions of the product you can find the corresponding option labelled Scan SSL when you go to Modules > Web Protection You could try reinstalling it, which might trigger the software into placing its certificates into the Firefox trust store again. Third-party antivirus software can interfere with Firefox's secure connections. In particular, the error code MOZILLA_PKIX_ERROR_MITM_DETECTED indicates that Firefox detected connection interception. The most common causes are security software scanning encrypted connections, or malware listening in and replacing legitimate website certificates with their own. If you get this problem on multiple unrelated HTTPS-sites, it indicates that something on your system or network is intercepting your connection and injecting certificates in a way that is not trusted by Firefox. The error occurs on multiple secure sites If you click the Advanced button on a 'Warning: Potential Security Risk Ahead' error page and you see the error code SEC_ERROR_UNKNOWN_ISSUER or MOZILLA_PKIX_ERROR_MITM_DETECTED, it means that the provided certificate was issued by a certificate authority that is not known by Firefox and, therefore, cannot be trusted by default.

3.1 Certificate issued by an authority belonging to Symantecĭuring a secure connection, a website must provide a certificate issued by a trusted certificate authority to ensure that the user is connected to the intended target and the connection is encrypted.

3 The error occurs on one particular site only.

2.3 Monitoring/filtering in corporate networks.

2.2 Family Safety settings in Windows accounts.

2 The error occurs on multiple secure sites.

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