* (menu bar) Tools > Page Info > Security > "View Certificate" * right-click (on Mac Ctrl+click) a blank area of the page and choose View Page Info > Security > "View Certificate" I recommend you always investigate ''who is the man in the middle'' before you do that. You should never need to create an exception for a well-run commercial website, particularly one that handles sensitive data. '''Unfortunately, it does not give you the option to add an exception, which clears up the problem most of the time.''' Periodically when Firefox is updated, it starts rejecting Yahoo Mail from loading, giving the "Your connection is not secure" / SEC_ERROR_UNKNOWN_ISSUER error. In the dialog that opens, the interesting part is the "Issued by" section, which often will help you track down the source of the interception.Īlso, for general reference, How to troubleshoot security error codes on secure websites.
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