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You’ll know if an extension is being regularly reviewed if it has one of the badges listed in this article.
Learn about the error codes SEC_ERROR_UNKNOWN_ISSUER MOZILLA_PKIX_ERROR_MITM_DETECTED and ERROR_SELF_SIGNED_CERT on HTTPS websites and how to troubleshoot.
Learn why you might see time-related errors on HTTPS websites and how you can troubleshoot these errors by correcting your system clock.
Options/Preferences panels give you access to Firefox settings. This article describes what types of settings are available in each panel.