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diff --git a/editor/libeditor/tests/test_bug468353.html b/editor/libeditor/tests/test_bug468353.html
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index 000000000..179c41cdc
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+++ b/editor/libeditor/tests/test_bug468353.html
@@ -0,0 +1,117 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=468353
+-->
+<head>
+  <title>Test for Bug 468353</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=468353">Mozilla Bug 468353</a>
+<p id="display"></p>
+<div id="content">
+  <iframe></iframe>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+var styleSheets = null;
+
+function checkStylesheets() {
+  // Evidently RemoveStyleSheet is the only method in nsIEditorStyleSheets
+  // that would throw. RemoveOverrideStyleSheet returns NS_OK even if the
+  // sheet is not there
+  var removed = 0;
+  try
+  {
+    styleSheets.removeStyleSheet("resource://gre/res/designmode.css");
+    removed++;
+  }
+  catch (ex) { }
+
+  try {
+    styleSheets.removeStyleSheet("resource://gre/res/contenteditable.css");
+    removed++;
+  }
+  catch (ex) { }
+
+  is(removed, 0, "Should have thrown if stylesheet was not there");
+}
+
+function runTest() {
+  const Ci = SpecialPowers.Ci;
+
+  /** Found while fixing bug 440614 **/
+  var editframe = window.frames[0];
+  var editdoc = editframe.document;
+  var editor = null;
+  editdoc.write('');
+  editdoc.close();
+
+  editdoc.designMode='on';
+
+  // Hold the reference to the editor
+  editor = SpecialPowers.wrap(editframe)
+                        .QueryInterface(Ci.nsIInterfaceRequestor)
+                        .getInterface(Ci.nsIWebNavigation)
+                        .QueryInterface(Ci.nsIInterfaceRequestor)
+                        .getInterface(Ci.nsIEditingSession)
+                        .getEditorForWindow(editframe);
+
+  styleSheets = editor.QueryInterface(Ci.nsIEditorStyleSheets);
+
+  editdoc.designMode='off';
+  
+  checkStylesheets();
+  
+  // Let go
+  editor = null;
+  styleSheets = null;
+  
+  editdoc.body.contentEditable = true;
+  
+  // Hold the reference to the editor
+  editor = SpecialPowers.wrap(editframe)
+                        .QueryInterface(Ci.nsIInterfaceRequestor)
+                        .getInterface(Ci.nsIWebNavigation)
+                        .QueryInterface(Ci.nsIInterfaceRequestor)
+                        .getInterface(Ci.nsIEditingSession)
+                        .getEditorForWindow(editframe);
+
+  styleSheets = editor.QueryInterface(Ci.nsIEditorStyleSheets);
+  
+  editdoc.body.contentEditable = false;
+  
+  checkStylesheets();
+
+  editdoc.designMode = "on";
+  editdoc.body.contentEditable = true;
+  editdoc.designMode = "off";
+
+  // Hold the reference to the editor
+  editor = SpecialPowers.wrap(editframe)
+                        .QueryInterface(Ci.nsIInterfaceRequestor)
+                        .getInterface(Ci.nsIWebNavigation)
+                        .QueryInterface(Ci.nsIInterfaceRequestor)
+                        .getInterface(Ci.nsIEditingSession)
+                        .getEditorForWindow(editframe);
+
+  styleSheets = editor.QueryInterface(Ci.nsIEditorStyleSheets);
+
+  editdoc.body.contentEditable = false;
+
+  checkStylesheets();
+  
+  SimpleTest.finish();
+}
+
+//XXX I don't know if this is necessary, but we're dealing with iframes...
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(runTest);
+
+</script>
+</pre>
+</body>
+</html>