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diff --git a/dom/html/test/test_bug391777.html b/dom/html/test/test_bug391777.html
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+++ b/dom/html/test/test_bug391777.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=391777
+-->
+<head>
+  <title>Test for Bug 391777</title>
+  <script type="text/javascript" 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=391777">Mozilla Bug 391777</a>
+<p id="display"></p>
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 391777 **/
+var arg = {};
+arg.testVal = "foo";
+var result = window.showModalDialog("javascript:window.returnValue = window.dialogArguments.testVal; window.close(); 'This window should close on its own.';", arg);
+ok(true, "We should get here without user interaction");
+is(result, "foo", "Unexpected result from showModalDialog");
+
+</script>
+</body>
+</html>