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diff --git a/dom/security/test/mixedcontentblocker/file_frameNavigation.html b/dom/security/test/mixedcontentblocker/file_frameNavigation.html
new file mode 100644
index 0000000000..ae76ec806f
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+++ b/dom/security/test/mixedcontentblocker/file_frameNavigation.html
@@ -0,0 +1,72 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Tests for Mixed Content Blocker related to navigating children, grandchildren, etc
+https://bugzilla.mozilla.org/show_bug.cgi?id=840388
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Tests for Mixed Content Frame Navigation</title>
+</head>
+<body>
+<div id="testContent"></div>
+
+<script>
+  var baseUrlHttps = "https://example.com/tests/dom/security/test/mixedcontentblocker/file_frameNavigation_innermost.html";
+
+  // For tests that require setTimeout, set the maximum polling time to 50 x 100ms = 5 seconds.
+  var MAX_COUNT = 50;
+  var TIMEOUT_INTERVAL = 100;
+
+  var testContent = document.getElementById("testContent");
+
+  // Test 1: Navigate secure iframe to insecure iframe on an insecure page
+  var iframe_test1 = document.createElement("iframe");
+  var counter_test1 = 0;
+  iframe_test1.src = baseUrlHttps + "?insecurePage_navigate_child";
+  iframe_test1.setAttribute("id", "test1");
+  iframe_test1.onerror = function() {
+    parent.postMessage({"test": "insecurePage_navigate_child", "msg": "got an onerror alert when loading or navigating testing iframe"}, "http://mochi.test:8888");
+  };
+  testContent.appendChild(iframe_test1);
+
+  function navigationStatus(iframe_test1)
+  {
+    // When the page is navigating, it goes through about:blank and we will get a permission denied for loc.
+    // Catch that specific exception and return
+    try {
+      var loc = document.getElementById("test1").contentDocument.location;
+    } catch(e) {
+      if (e.name === "SecurityError") {
+        // We received an exception we didn't expect.
+        throw e;
+      }
+      counter_test1++;
+      return;
+    }
+    if (loc == "http://example.com/tests/dom/security/test/mixedcontentblocker/file_frameNavigation_innermost.html?insecurePage_navigate_child_response") {
+      return;
+    }
+    if (counter_test1 < MAX_COUNT) {
+      counter_test1++;
+      setTimeout(navigationStatus, TIMEOUT_INTERVAL, iframe_test1);
+    }
+    else {
+      // After we have called setTimeout the maximum number of times, assume navigating the iframe is blocked
+      parent.postMessage({"test": "insecurePage_navigate_child", "msg": "navigating to insecure iframe blocked on insecure page"}, "http://mochi.test:8888");
+    }
+  }
+
+  setTimeout(navigationStatus, TIMEOUT_INTERVAL, iframe_test1);
+
+  // Test 2: Navigate secure grandchild iframe to insecure grandchild iframe on a page that has no secure parents
+  var iframe_test2 = document.createElement("iframe");
+  iframe_test2.src = "http://example.com/tests/dom/security/test/mixedcontentblocker/file_frameNavigation_grandchild.html"
+  iframe_test2.onerror = function() {
+    parent.postMessage({"test": "insecurePage_navigate_grandchild", "msg": "got an on error alert when loading or navigating testing iframe"}, "http://mochi.test:8888");
+  };
+  testContent.appendChild(iframe_test2);
+
+</script>
+</body>
+</html>