diff --git a/mozilla/layout/generic/test/Makefile.in b/mozilla/layout/generic/test/Makefile.in
index 522a9d1fcc9..88c5ce6a764 100644
--- a/mozilla/layout/generic/test/Makefile.in
+++ b/mozilla/layout/generic/test/Makefile.in
@@ -47,6 +47,7 @@ include $(topsrcdir)/config/rules.mk
 _TEST_FILES = 	test_bug323656.html \
 		test_bug344830.html \
 		bug344830_testembed.svg \
+		test_bug391747.html \
 		$(NULL)
 
 libs:: $(_TEST_FILES)
diff --git a/mozilla/layout/generic/test/test_bug391747.html b/mozilla/layout/generic/test/test_bug391747.html
new file mode 100644
index 00000000000..94c339ece7a
--- /dev/null
+++ b/mozilla/layout/generic/test/test_bug391747.html
@@ -0,0 +1,52 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=391747
+-->
+<head>
+  <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
+  <title>Test for bug 391747</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <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=391747">Mozilla Bug 391747</a>
+<p id="display"></p>
+<div id="content" style="display: block">
+<iframe id="iframe_391747" src="data:text/html,<table><tr><td style='width:500px;height:500px;border:1px solid blue'>x</td>"></iframe>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+function ctrlclick_391747(doc,x,y){
+  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+  var wu =  doc.defaultView.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
+               .getInterface(Components.interfaces.nsIDOMWindowUtils);
+  wu.sendMouseEvent('mousedown',  x, y, 0, 1, 2);
+  wu.sendMouseEvent('mouseup',  x, y, 0, 1, 2);
+}
+
+function select_391747(doc){
+  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+  var range = doc.createRange();
+  range.setStart(doc, 0);
+  range.setEnd(doc, 0);
+  doc.defaultView.getSelection().addRange(range);
+}
+
+function boom_391747() {
+  var target = document.getElementById('iframe_391747')
+  select_391747(target.contentDocument)
+  ctrlclick_391747(target.contentDocument, 100, 100);
+  ok(true, "pass");
+  SimpleTest.finish();
+}
+
+setTimeout(boom_391747,400)
+SimpleTest.waitForExplicitFinish()
+
+</script>
+</pre>
+</body>
+</html>
