diff --git a/browser/base/content/browser.js b/browser/base/content/browser.js
index 906499652a8..51a67b07352 100644
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -936,7 +936,6 @@ var gBrowserInit = {
     LanguageDetectionListener.init();
     BrowserOnClick.init();
     DevEdition.init();
-    AboutPrivateBrowsingListener.init();
 
     let mm = window.getGroupMessageManager("browsers");
     mm.loadFrameScript("chrome://browser/content/content.js", true);
@@ -7776,13 +7775,3 @@ let PanicButtonNotifier = {
     popup.hidePopup();
   },
 };
-
-let AboutPrivateBrowsingListener = {
-  init: function () {
-    window.messageManager.addMessageListener(
-      "AboutPrivateBrowsing:OpenPrivateWindow",
-      msg => {
-        OpenBrowserWindow({private: true});
-    });
-  }
-};
diff --git a/browser/base/content/content.js b/browser/base/content/content.js
index 46f25788a2c..a82c4a1767b 100644
--- a/browser/base/content/content.js
+++ b/browser/base/content/content.js
@@ -479,29 +479,6 @@ let AboutHomeListener = {
 };
 AboutHomeListener.init(this);
 
-let AboutPrivateBrowsingListener = {
-  init: function(chromeGlobal) {
-    chromeGlobal.addEventListener('AboutPrivateBrowsingOpenWindow', this,
-                                  false, true);
-  },
-
-  get isAboutPrivateBrowsing() {
-    return content.document.documentURI.toLowerCase() == "about:privatebrowsing";
-  },
-
-  handleEvent: function(aEvent) {
-    if (!this.isAboutPrivateBrowsing) {
-      return;
-    }
-    switch (aEvent.type) {
-      case "AboutPrivateBrowsingOpenWindow":
-        sendAsyncMessage("AboutPrivateBrowsing:OpenPrivateWindow");
-        break;
-    }
-  },
-};
-AboutPrivateBrowsingListener.init(this);
-
 let AboutReaderListener = {
 
   _articlePromise: null,
diff --git a/browser/base/content/test/general/browser_bug963945.js b/browser/base/content/test/general/browser_bug963945.js
index 4531964b0c3..5a68d3f3565 100644
--- a/browser/base/content/test/general/browser_bug963945.js
+++ b/browser/base/content/test/general/browser_bug963945.js
@@ -7,17 +7,24 @@
  * opened one time when in private browsing.
  */
 
-add_task(function* test() {
-  let win = yield BrowserTestUtils.openNewBrowserWindow({private: true});
+function test() {
+  waitForExplicitFinish();
+	
+  var win = OpenBrowserWindow({private: true});
 
-  let tab = win.gBrowser.selectedTab = win.gBrowser.addTab("about:addons");
-  yield BrowserTestUtils.browserLoaded(tab.linkedBrowser);
-  yield promiseWaitForFocus(win);
+  whenDelayedStartupFinished(win, function() {
+    win.gBrowser.loadURI("about:addons");
 
-  EventUtils.synthesizeKey("a", { ctrlKey: true, shiftKey: true }, win);
+    waitForFocus(function() {
+      EventUtils.synthesizeKey("a", { ctrlKey: true, shiftKey: true }, win);
+
+      is(win.gBrowser.tabs.length, 1, "about:addons tab was re-focused.");
+      is(win.gBrowser.currentURI.spec, "about:addons", "Addons tab was opened.");
+
+      win.close();
+      finish();    
+    });
+  });
+}
 
-  is(win.gBrowser.tabs.length, 2, "about:addons tab was re-focused.");
-  is(win.gBrowser.currentURI.spec, "about:addons", "Addons tab was opened.");
 
-  yield BrowserTestUtils.closeWindow(win);
-});
diff --git a/browser/components/about/AboutRedirector.cpp b/browser/components/about/AboutRedirector.cpp
index de41b231c38..2da8a66f1dc 100644
--- a/browser/components/about/AboutRedirector.cpp
+++ b/browser/components/about/AboutRedirector.cpp
@@ -61,7 +61,6 @@ static RedirEntry kRedirMap[] = {
     nsIAboutModule::ALLOW_SCRIPT |
     nsIAboutModule::HIDE_FROM_ABOUTABOUT },
   { "privatebrowsing", "chrome://browser/content/aboutPrivateBrowsing.xhtml",
-    nsIAboutModule::URI_MUST_LOAD_IN_CHILD |
     nsIAboutModule::ALLOW_SCRIPT },
   { "rights",
 #ifdef MOZ_OFFICIAL_BRANDING
diff --git a/browser/components/privatebrowsing/content/aboutPrivateBrowsing.js b/browser/components/privatebrowsing/content/aboutPrivateBrowsing.js
index b2f6b3dc7d8..eecb9e9556d 100644
--- a/browser/components/privatebrowsing/content/aboutPrivateBrowsing.js
+++ b/browser/components/privatebrowsing/content/aboutPrivateBrowsing.js
@@ -17,6 +17,13 @@ if (!PrivateBrowsingUtils.isContentWindowPrivate(window)) {
   setFavIcon("chrome://browser/skin/Privacy-16.png");
 }
 
+var mainWindow = window.QueryInterface(Ci.nsIInterfaceRequestor)
+                       .getInterface(Ci.nsIWebNavigation)
+                       .QueryInterface(Ci.nsIDocShellTreeItem)
+                       .rootTreeItem
+                       .QueryInterface(Ci.nsIInterfaceRequestor)
+                       .getInterface(Ci.nsIDOMWindow);
+
 function setFavIcon(url) {
   var icon = document.createElement("link");
   icon.setAttribute("rel", "icon");
@@ -47,7 +54,5 @@ document.addEventListener("DOMContentLoaded", function () {
 }, false);
 
 function openPrivateWindow() {
-  // Ask chrome to open a private window
-  document.dispatchEvent(
-    new CustomEvent("AboutPrivateBrowsingOpenWindow", {bubbles:true}));
+  mainWindow.OpenBrowserWindow({private: true});
 }
diff --git a/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_downloadLastDir.js b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_downloadLastDir.js
index 5402398b765..962c860928e 100644
--- a/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_downloadLastDir.js
+++ b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_downloadLastDir.js
@@ -48,6 +48,8 @@ function test() {
 
   function testDownloadDir(aWin, gDownloadLastDir, aFile, aDisplayDir, aLastDir,
                            aGlobalLastDir, aCallback) {
+    let context = aWin.gBrowser.selectedBrowser.contentWindow;
+
     // Check lastDir preference.
     is(prefs.getComplexValue("lastDir", Ci.nsIFile).path, aDisplayDir.path,
        "LastDir should be the expected display dir");
@@ -76,7 +78,7 @@ function test() {
       aCallback();
     };
 
-    launcherDialog.promptForSaveToFileAsync(launcher, aWin, null, null, null);
+    launcherDialog.promptForSaveToFileAsync(launcher, context, null, null, null);
   }
 
   testOnWindow(false, function(win, downloadDir) {