MY FACEBOOK NOT OPEN ESC ERROR
An error occurred during a connection to www.facebook.com. SSL_ERROR_DC_EXPIRED
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Note that you can possibly disable Delegated Credentials via the about:config page to test for issues.
- about:config => security.tls.enable_delegated_credentials = false
You can open the about:config page via the location/address bar. You can click the button to "Accept the Risk and Continue".
You can remove all data stored in Firefox for a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").
Using "Forget About This Site" will remove all data stored in Firefox for this domain like history and cookies and passwords and exceptions and cache, so be cautious. If you have a password or other data for that domain that you do not want to lose then make sure to backup this data or make a note.
You can't recover from this 'forget' unless you have a backup of involved files.
If you revisit a 'forgotten' website then data for that website will be saved once again.