diff -r 000000000000 -r 6474c204b198 dom/tests/browser/browser_localStorage_privatestorageevent.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/tests/browser/browser_localStorage_privatestorageevent.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,109 @@
+function test() {
+  waitForExplicitFinish();
+
+  let windowsToClose = [];
+  function testOnWindow(options, callback) {
+    let win = OpenBrowserWindow(options);
+    windowsToClose.push(win);
+    win.addEventListener("load", function onLoad() {
+      win.removeEventListener("load", onLoad, false);
+      win.addEventListener("DOMContentLoaded", function onInnerLoad() {
+        if (win.content.location.href != "about:blank") {
+          win.gBrowser.loadURI("about:blank");
+          return;
+        }
+        win.removeEventListener("DOMContentLoaded", onInnerLoad, true);
+        executeSoon(function() callback(win));
+      }, true);
+      if (!options) {
+        win.gBrowser.loadURI("about:blank");
+      }
+    }, false);
+  }
+
+  Services.prefs.setIntPref("browser.startup.page", 0);
+  Services.prefs.setCharPref("browser.startup.homepage_override.mstone", "ignore");
+
+  registerCleanupFunction(function() {
+    Services.prefs.clearUserPref("browser.startup.page");
+    Services.prefs.clearUserPref("browser.startup.homepage_override.mstone");
+    for (var i in windowsToClose) {
+      windowsToClose[i].close();
+    }
+  });
+
+  var phase = 0;
+  function step(data) {
+      switch (++phase) {
+        case 1:
+          is(data, "reply", "should have got reply message");
+          privWin.postMessage('query?', 'http://mochi.test:8888');
+          break;
+        case 2:
+          is(data.split(':')[0], "data", "should have got data message");
+          is(data.split(':')[1], "false", "priv window should not see event");
+          privWin.postMessage('setKey', 'http://mochi.test:8888');
+          break;
+        case 3:
+          is(data, "reply", "should have got reply message");
+          pubWin.postMessage('query?', 'http://mochi.test:8888');
+          break;
+        case 4:
+          is(data.split(':')[0], "data", "should have got data message");
+          is(data.split(':')[1], "false", "pub window should not see event");
+          finish();
+          break;
+      }
+  }
+
+  let loads = 0;
+  function waitForLoad() {
+    loads++;
+    if (loads != 2) {
+      return;
+    };
+    pubWin.postMessage('setKey', 'http://mochi.test:8888');
+  }
+
+  var privWin;
+  testOnWindow({private: true}, function(aPrivWin) {
+    let doc = aPrivWin.content.document;
+    let iframe = doc.createElement('iframe');
+    iframe.setAttribute('id', 'target2');
+    doc.body.appendChild(iframe);
+    aPrivWin.content.is = is;
+    aPrivWin.content.isnot = isnot;
+    aPrivWin.content.ok = ok;
+    iframe.onload = function() {
+      privWin = iframe.contentWindow;
+      privWin.addEventListener('message', function msgHandler(ev) {
+        if (ev.data == 'setKey' || ev.data == 'query?')
+          return;
+        step(ev.data);
+      }, true);
+      waitForLoad();
+    };
+    iframe.src = "http://mochi.test:8888/browser/dom/tests/browser/page_privatestorageevent.html";
+  });
+
+  var pubWin;
+  testOnWindow(undefined, function(aWin) {
+    let doc = aWin.content.document;
+    let iframe = doc.createElement('iframe');
+    iframe.setAttribute('id', 'target');
+    doc.body.appendChild(iframe);
+    aWin.content.is = is;
+    aWin.content.isnot = isnot;
+    aWin.content.ok = ok;
+    iframe.onload = function() {
+      pubWin = iframe.contentWindow;
+      pubWin.addEventListener('message', function msgHandler(ev) {
+        if (ev.data == 'setKey' || ev.data == 'query?')
+          return;
+        step(ev.data);
+      }, true);
+      waitForLoad();
+    };
+    iframe.src = "http://mochi.test:8888/browser/dom/tests/browser/page_privatestorageevent.html";
+  });
+}
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