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Security Alert related to firefox.exe

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BitDefender antivirus is showing me this message too many times "firefox.exe attempted to establish a connection relying on an expired certificate to hkkp.waiver-serious.net. We blocked the connection to keep your data safe since websites must renew their certificates with a certification authority to stay current, and outdated security certificates represent a risk." How can I solve this problem? I did a full scan and my computer is clean

BitDefender antivirus is showing me this message too many times "firefox.exe attempted to establish a connection relying on an expired certificate to hkkp.waiver-serious.net. We blocked the connection to keep your data safe since websites must renew their certificates with a certification authority to stay current, and outdated security certificates represent a risk." How can I solve this problem? I did a full scan and my computer is clean

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Unless that was default Firefox install that's not something firefox would install.

https://support.mozilla.org/en-US/questions/878694 https://support.mozilla.org/en-US/kb/secure-website-certificate