diff --git a/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_windowtitle.js b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_windowtitle.js
index 558502f1bf1..ce25fd97959 100644
--- a/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_windowtitle.js
+++ b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_windowtitle.js
@@ -80,35 +80,44 @@ function test() {
 
     let tab = gBrowser.selectedTab = gBrowser.addTab();
     let browser = gBrowser.selectedBrowser;
-    browser.addEventListener("load", function() {
-      browser.removeEventListener("load", arguments.callee, true);
+    // ensure that the test is run after the titlebar has been updated
+    let timer = null;
+    let _updateTitlebar = gBrowser.updateTitlebar;
+    gBrowser.updateTitlebar = function() {
+      if (timer) {
+        timer.cancel();
+        timer = null;
+      }
+      timer = Cc["@mozilla.org/timer;1"].
+              createInstance(Ci.nsITimer);
+      timer.initWithCallback(function () {
+        _updateTitlebar.apply(gBrowser, arguments);
+        gBrowser.updateTitlebar = _updateTitlebar;
+        is(document.title, expected_title, "The window title for " + url +
+           " is correct (" + (insidePB ? "inside" : "outside") +
+           " private browsing mode)");
 
-      // ensure that the test is run after the page onload event
-      setTimeout(function() {
-        setTimeout(function() {
-          is(document.title, expected_title, "The window title for " + url +
-             " is correct (" + (insidePB ? "inside" : "outside") +
-             " private browsing mode)");
+        let win = gBrowser.replaceTabWithWindow(tab);
+        win.addEventListener("load", function() {
+          win.removeEventListener("load", arguments.callee, false);
 
-          let win = gBrowser.replaceTabWithWindow(tab);
-          win.addEventListener("load", function() {
-            win.removeEventListener("load", arguments.callee, false);
+          // ensure that the test is run after delayedStartup
+          let _delayedStartup = win.delayedStartup;
+          win.delayedStartup = function() {
+            _delayedStartup.apply(win, arguments);
+            win.delayedStartup = _delayedStartup;
 
-            // ensure that the test is run after delayedStartup
-            setTimeout(function() {
-              setTimeout(function() {
-                is(win.document.title, expected_title, "The window title for " + url +
-                   " detahced tab is correct (" + (insidePB ? "inside" : "outside") +
-                   " private browsing mode)");
-                win.close();
+            is(win.document.title, expected_title, "The window title for " + url +
+               " detached tab is correct (" + (insidePB ? "inside" : "outside") +
+               " private browsing mode)");
+            win.close();
+
+            setTimeout(funcNext, 0);
+          };
+        }, false);
+      }, 300, Ci.nsITimer.TYPE_ONE_SHOT);
+    };
 
-                funcNext();
-              }, 0);
-            }, 0);
-          }, false);
-        }, 0);
-      }, 0);
-    }, true);
     browser.loadURI(url);
   }