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diff --git a/editor/composer/test/test_bug1266815.html b/editor/composer/test/test_bug1266815.html
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+++ b/editor/composer/test/test_bug1266815.html
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+<!DOCTYPE html>
+<html>
+<head>
+  <script type="text/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="chrome://mochikit/content/tests/SimpleTest/SpawnTask.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<script type="text/javascript">
+const Cc = SpecialPowers.Cc;
+const Ci = SpecialPowers.Ci;
+const Cu = SpecialPowers.Cu;
+
+const {XPCOMUtils} = Cu.import("resource://gre/modules/XPCOMUtils.jsm", {});
+
+const HELPERAPP_DIALOG_CID =
+        SpecialPowers.wrap(SpecialPowers.Components)
+        .ID(Cc["@mozilla.org/helperapplauncherdialog;1"].number);
+const HELPERAPP_DIALOG_CONTRACT_ID = "@mozilla.org/helperapplauncherdialog;1";
+const MOCK_HELPERAPP_DIALOG_CID =
+        SpecialPowers.wrap(SpecialPowers.Components)
+        .ID("{391832c8-5232-4676-b838-cc8ad373f3d8}");
+
+var registrar = SpecialPowers.wrap(Components).manager
+                .QueryInterface(Ci.nsIComponentRegistrar);
+
+var helperAppDlgPromise = new Promise(function(resolve) {
+  var mockHelperAppService;
+
+  function HelperAppLauncherDialog() {
+  }
+
+  HelperAppLauncherDialog.prototype = {
+    show: function(aLauncher, aWindowContext, aReason) {
+      ok(true, "Whether showing Dialog");
+      resolve();
+      registrar.unregisterFactory(MOCK_HELPERAPP_DIALOG_CID,
+                                  mockHelperAppService);
+    },
+    QueryInterface: XPCOMUtils.generateQI([Ci.nsIHelperAppLauncherDialog])
+  };
+
+  mockHelperAppService = XPCOMUtils._getFactory(HelperAppLauncherDialog);
+  registrar.registerFactory(MOCK_HELPERAPP_DIALOG_CID, "",
+                            HELPERAPP_DIALOG_CONTRACT_ID,
+                            mockHelperAppService);
+});
+
+add_task(function*() {
+  let promise = new Promise(function(resolve) {
+    let iframe = document.createElement("iframe");
+    iframe.onload = function() {
+      is(iframe.contentDocument.getElementById("edit").innerText, "abc",
+         "load iframe source");
+      resolve();
+    };
+    iframe.id = "testframe";
+    iframe.src = "data:text/html,<div id=edit contenteditable=true>abc</div>";
+    document.body.appendChild(iframe);
+  });
+
+  yield promise;
+
+  let iframe = document.getElementById("testframe");
+  let docShell = SpecialPowers.wrap(iframe.contentWindow)
+                 .QueryInterface(Ci.nsIInterfaceRequestor)
+                 .getInterface(Ci.nsIWebNavigation)
+                 .QueryInterface(Ci.nsIDocShell);
+
+  ok(docShell.hasEditingSession, "Should have editing session");
+
+  document.getElementById("testframe").src =
+    "data:application/octet-stream,TESTCONTENT";
+
+  yield helperAppDlgPromise;
+
+  ok(docShell.hasEditingSession, "Should have editing session");
+});
+</script>
+</body>
+</html>