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How do you fix error message sec_error_untrusted_issuer which comes up for Facebook?

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The article from Mozilla support explains what this error message means, but does not offer a way round it.

Chosen solution

  1. Type about:support in URL
  2. Goto Profile Directory labeled "Open Containing Folder" click that to open
  3. Close the firefox from background too
  4. Rename the file cert8.db to back_cert8.db
  5. Open the firefox and try it out
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Chosen Solution

  1. Type about:support in URL
  2. Goto Profile Directory labeled "Open Containing Folder" click that to open
  3. Close the firefox from background too
  4. Rename the file cert8.db to back_cert8.db
  5. Open the firefox and try it out