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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.
Page that describes how Firefox detects captive portal networks.
Enhanced Tracking Protection in Firefox automatically protects your privacy while you browse.
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.