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diff --git a/layout/forms/test/test_bug378670.html b/layout/forms/test/test_bug378670.html
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+++ b/layout/forms/test/test_bug378670.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=378670
+-->
+<head>
+  <title>Test for Bug 378670</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.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=378670">Mozilla Bug 378670</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+Clicking on the select should not crash Mozilla
+<select id="select">
+<option>1</option>
+<option>2</option>
+</select>
+
+<pre id="test">
+<script>
+document.body.addEventListener('popupshowing', function(e) {e.target.remove() }, true);
+</script>
+<script type="application/javascript">
+
+/** Test for Bug 378670 **/
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestFlakyTimeout("untriaged");
+
+function clickit() {
+  var select = document.getElementById('select');
+
+  sendMouseEvent({type:'mousedown'}, select);
+  sendMouseEvent({type:'mouseup'}, select);
+  sendMouseEvent({type:'click'}, select);
+
+  setTimeout(finish, 200);
+}
+
+window.addEventListener('load', clickit);
+
+function finish()
+{
+  ok(true, "This is a mochikit version of a crash test. To complete is to pass.");
+  SimpleTest.finish();
+}
+</script>
+</pre>
+</body>
+</html>