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diff --git a/layout/inspector/tests/test_bug462787.html b/layout/inspector/tests/test_bug462787.html
new file mode 100644
index 0000000000..62548bd02c
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+++ b/layout/inspector/tests/test_bug462787.html
@@ -0,0 +1,99 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=462787
+-->
+<head>
+  <title>Test for Bug 462787</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=462787">Mozilla Bug 462787</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 462787 **/
+
+const InspectorUtils = SpecialPowers.InspectorUtils;
+
+function do_test() {
+  try {
+    InspectorUtils.getCSSStyleRules(null);
+    ok(false, "expected an exception"); 
+  }
+  catch(e) {
+    is(e.name, "TypeError", "got the expected exception");
+  }
+
+  try {
+    InspectorUtils.getRuleLine(null);
+    ok(false, "expected an exception"); 
+  }
+  catch(e) {
+    is(e.name, "TypeError", "got the expected exception");
+  }
+
+  try {
+    InspectorUtils.isIgnorableWhitespace(null);
+    ok(false, "expected an exception");
+  }
+  catch(e) {
+    is(e.name, "TypeError", "got the expected exception");
+  }
+
+  try {
+    InspectorUtils.getParentForNode(null, true);
+    ok(false, "expected an exception");
+  }
+  catch(e) {
+    is(e.name, "TypeError", "got the expected exception");
+  }
+
+  try {
+    InspectorUtils.getContentState(null); 
+    ok(false, "expected an exception"); 
+  }
+  catch(e) {
+    is(e.name, "TypeError", "got the expected exception");
+  }
+
+  try {
+    InspectorUtils.setContentState(null, false); 
+    ok(false, "expected an exception"); 
+  }
+  catch(e) {
+    is(e.name, "TypeError", "got the expected exception");
+  }
+
+  try {
+    InspectorUtils.setContentState(document.documentElement, 3);
+    ok(false, "expected an exception");
+  }
+  catch(e) {
+    ok(true, "Threw");
+  }
+
+  try {
+    InspectorUtils.removeContentState(document.documentElement, 3);
+    ok(false, "expected an exception");
+  }
+  catch(e) {
+    ok(true, "Threw");
+  }
+
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(do_test);
+
+
+</script>
+</pre>
+</body>
+</html>