Bug 1646079 - Port |Bug 1450967 - mitm detection v0.0.1| to SeaMonkey. r=frg

suite/browser/content.js

@@ -89,6 +89,7 @@ const SEC_ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED  = SEC_ERROR_BASE + 176;
 const MOZILLA_PKIX_ERROR_NOT_YET_VALID_CERTIFICATE = MOZILLA_PKIX_ERROR_BASE + 5;
 const MOZILLA_PKIX_ERROR_NOT_YET_VALID_ISSUER_CERTIFICATE = MOZILLA_PKIX_ERROR_BASE + 6;
 const MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT          = MOZILLA_PKIX_ERROR_BASE + 14;
+const MOZILLA_PKIX_ERROR_MITM_DETECTED             = MOZILLA_PKIX_ERROR_BASE + 15;
 
 
 const SSL_ERROR_BASE = Ci.nsINSSErrorsService.NSS_SSL_ERROR_BASE;
@@ -177,6 +178,9 @@ var AboutNetAndCertErrorListener = {
 
     if (sslStatus.isUntrusted) {
       switch (securityInfo.errorCode) {
+        case MOZILLA_PKIX_ERROR_MITM_DETECTED:
+          msg += gPipNSSBundle.GetStringFromName("certErrorTrust_MitM") + "\n";
+          break;
         case SEC_ERROR_UNKNOWN_ISSUER:
           msg += gPipNSSBundle.GetStringFromName("certErrorTrust_UnknownIssuer") + "\n";
           msg += gPipNSSBundle.GetStringFromName("certErrorTrust_UnknownIssuer2") + "\n";