Why do I sometimes have this bad_mac_error?

Here is the link to the image of error:
Error image
Am I infected with some kind of malware or Trojan horse?
Thank you

Try renaming the file cert8.db in the Firefox profile folder in cert8.db.old or remove the cert8.db file to remove the intermediate certificates that Firefox has stored.

If it helped to solve the problem, then you can delete the renamed file cert8.db.old.

Otherwise you can rename (or copy) the file cert8.db.old to cert8.db to restore previous intermediary certificates.

Firefox automatically records the intermediate certificates when you visit Web sites that send such a certificate.

You can use this button to go to the Firefox profile folder:

  • Help > troubleshooting information > profile directory: opens showing the file

Tags: Firefox

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