connection not secure

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  Suddenly i can not longer access my hotmail account using the firefox browser.  It displays this message:

  Your connection is not secure
  
  The owner of col129.mail.live.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.

  Tuesday, February 14, 2017 5:17 PM

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