diff --git a/browser/components/safebrowsing/content/test/head.js b/browser/components/safebrowsing/content/test/head.js
index 7c5518da973d..c81bd8a43cbc 100644
--- a/browser/components/safebrowsing/content/test/head.js
+++ b/browser/components/safebrowsing/content/test/head.js
@@ -86,7 +86,7 @@ function waitForDBInit(callback) {
   });
 }
 
-Services.prefs.setCharPref("urlclassifier.malwareTable", "test-malware-simple,test-unwanted-simple");
+Services.prefs.setCharPref("urlclassifier.malwareTable", "test-malware-simple,test-unwanted-simple,test-harmful.simple");
 Services.prefs.setCharPref("urlclassifier.phishTable", "test-phish-simple");
 Services.prefs.setCharPref("urlclassifier.blockedTable", "test-block-simple");
 SafeBrowsing.init();
diff --git a/toolkit/components/url-classifier/tests/mochitest/test_classifier.html b/toolkit/components/url-classifier/tests/mochitest/test_classifier.html
index fa66987eb61d..9ed91d32eda0 100644
--- a/toolkit/components/url-classifier/tests/mochitest/test_classifier.html
+++ b/toolkit/components/url-classifier/tests/mochitest/test_classifier.html
@@ -33,7 +33,10 @@ var testData = [
   },
   { url: "blocked.example.com/",
     db: "test-block-simple"
-  }
+  },
+  { url: "harmful.example.com/",
+    db: "test-harmful-simple"
+  },
 ];
 
 const Cc = SpecialPowers.Cc;
@@ -81,6 +84,16 @@ var testURLs = [
     table: "test-phish-simple",
     result: Cr.NS_ERROR_PHISHING_URI
   },
+  { url: "http://harmful.example.com",
+    trackingProtection: false,
+    table: "test-harmful-simple",
+    result: Cr.NS_ERROR_HARMFUL_URI
+  },
+  { url: "http://harmful.example.com",
+    trackingProtection: true,
+    table: "test-harmful-simple",
+    result: Cr.NS_ERROR_HARMFUL_URI
+  },
   { url: "http://tracking.example.com",
     trackingProtection: false,
     table: "test-track-simple",
@@ -135,7 +148,7 @@ function testService() {
         return;
       }
       let test = testURLs.shift();
-      let tables = "test-malware-simple,test-unwanted-simple,test-phish-simple,test-track-simple,test-block-simple";
+      let tables = "test-malware-simple,test-unwanted-simple,test-phish-simple,test-track-simple,test-block-simple,test-harmful-simple";
       let uri = ios.newURI(test.url);
       let prin = ssm.createCodebasePrincipal(uri, {});
       is(service.classifyLocal(uri, tables), test.table,
@@ -158,10 +171,11 @@ function testService() {
 }
 
 SpecialPowers.pushPrefEnv(
-  {"set" : [["urlclassifier.malwareTable", "test-malware-simple,test-unwanted-simple"],
+  {"set" : [["urlclassifier.malwareTable", "test-malware-simple,test-unwanted-simple,test-harmful-simple"],
             ["urlclassifier.phishTable", "test-phish-simple"],
             ["urlclassifier.downloadBlockTable", "test-block-simple"],
             ["urlclassifier.trackingTable", "test-track-simple"],
+            ["browser.safebrowsing.debug", true],
             ["privacy.trackingprotection.annotate_channels", true]]},
   function() {
     classifierHelper.waitForInit()
diff --git a/toolkit/components/url-classifier/tests/unit/head_urlclassifier.js b/toolkit/components/url-classifier/tests/unit/head_urlclassifier.js
index 62bcde83a738..be55f6bff4e0 100644
--- a/toolkit/components/url-classifier/tests/unit/head_urlclassifier.js
+++ b/toolkit/components/url-classifier/tests/unit/head_urlclassifier.js
@@ -56,12 +56,14 @@ function cleanUp() {
   delFile("safebrowsing/test-malware-simple.sbstore");
   delFile("safebrowsing/test-unwanted-simple.sbstore");
   delFile("safebrowsing/test-block-simple.sbstore");
+  delFile("safebrowsing/test-harmful-simple.sbstore");
   delFile("safebrowsing/test-track-simple.sbstore");
   delFile("safebrowsing/test-trackwhite-simple.sbstore");
   delFile("safebrowsing/test-phish-simple.pset");
   delFile("safebrowsing/test-malware-simple.pset");
   delFile("safebrowsing/test-unwanted-simple.pset");
   delFile("safebrowsing/test-block-simple.pset");
+  delFile("safebrowsing/test-harmful-simple.pset");
   delFile("safebrowsing/test-track-simple.pset");
   delFile("safebrowsing/test-trackwhite-simple.pset");
   delFile("safebrowsing/moz-phish-simple.sbstore");
diff --git a/toolkit/components/url-classifier/tests/unit/test_threat_type_conversion.js b/toolkit/components/url-classifier/tests/unit/test_threat_type_conversion.js
index f7c51b9562a7..023bcab2b34f 100644
--- a/toolkit/components/url-classifier/tests/unit/test_threat_type_conversion.js
+++ b/toolkit/components/url-classifier/tests/unit/test_threat_type_conversion.js
@@ -7,6 +7,7 @@ function run_test() {
   equal(urlUtils.convertListNameToThreatType("goog-malware-proto"), 1);
   equal(urlUtils.convertListNameToThreatType("googpub-phish-proto"), 2);
   equal(urlUtils.convertListNameToThreatType("goog-unwanted-proto"), 3);
+  equal(urlUtils.convertListNameToThreatType("goog-harmful-proto"), 4);
   equal(urlUtils.convertListNameToThreatType("goog-phish-proto"), 5);
 
   try {
@@ -23,6 +24,7 @@ function run_test() {
   equal(urlUtils.convertThreatTypeToListNames(1), "goog-malware-proto");
   equal(urlUtils.convertThreatTypeToListNames(2), "googpub-phish-proto,test-phish-proto");
   equal(urlUtils.convertThreatTypeToListNames(3), "goog-unwanted-proto,test-unwanted-proto");
+  equal(urlUtils.convertThreatTypeToListNames(4), "goog-harmful-proto");
   equal(urlUtils.convertThreatTypeToListNames(5), "goog-phish-proto");
 
   try {