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diff --git a/dom/tests/mochitest/chrome/test_docshell_swap.xul b/dom/tests/mochitest/chrome/test_docshell_swap.xul
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+++ b/dom/tests/mochitest/chrome/test_docshell_swap.xul
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+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<window title="Docshell swap test"
+ xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+ <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+ <!-- test results are displayed in the html:body -->
+ <body xmlns="http://www.w3.org/1999/xhtml">
+
+ </body>
+
+ <!-- test code goes here -->
+ <script type="application/javascript">
+ <![CDATA[
+
+ SimpleTest.waitForExplicitFinish();
+
+ // Create two identical windows, each with a <browser> element.
+ let win1 = window.openDialog("window_docshell_swap.xul", "_blank","chrome,width=300,height=200");
+ let win2 = window.openDialog("window_docshell_swap.xul", "_blank","chrome,width=300,height=200");
+
+ let loadCount = 0;
+ function loadHandler() {
+ loadCount++;
+ if (loadCount < 2)
+ return;
+
+ let browser1 = win1.document.getElementById("browser");
+ let browser2 = win2.document.getElementById("browser");
+
+ let flo1 = browser1.QueryInterface(Components.interfaces.nsIFrameLoaderOwner);
+ let flo2 = browser2.QueryInterface(Components.interfaces.nsIFrameLoaderOwner);
+
+ let pongCount = 0;
+
+ function gotPong(target_ok) {
+ pongCount++;
+ ok(target_ok, "message went to correct target");
+ if (pongCount == 1) {
+ win1.close();
+ win2.close();
+ SimpleTest.finish();
+ }
+ }
+
+ let mm1 = flo1.frameLoader.messageManager;
+ let mm2 = flo2.frameLoader.messageManager;
+
+ // Swap docshells. Everything should be identical to before, since there was nothing to
+ // distinguish these docshells.
+ flo1.swapFrameLoaders(flo2);
+
+ // mm1 shouldn't change here, but we update it in case it does due to a bug.
+ mm1 = flo1.frameLoader.messageManager;
+
+ // Load ping-pong code into first window.
+ mm1.loadFrameScript("data:,addMessageListener('ping', () => sendAsyncMessage('pong'));", false);
+
+ // A pong message received in win1 means success.
+ win1.messageManager.addMessageListener("pong", () => { gotPong(true); });
+
+ // A pong message received in win2 means failure!
+ win2.messageManager.addMessageListener("pong", () => { gotPong(false); });
+
+ // Send the ping to win1.
+ mm1.sendAsyncMessage("ping");
+ }
+
+ win1.addEventListener("load", loadHandler, false);
+ win2.addEventListener("load", loadHandler, false);
+ ]]>
+ </script>
+</window>