--- a/browser/base/content/test/popupNotifications/browser_popupNotification_4.js
+++ b/browser/base/content/test/popupNotifications/browser_popupNotification_4.js
@@ -128,17 +128,19 @@ var tests = [
 
       let notification = showNotification(notifyObj);
       let win = gBrowser.replaceTabWithWindow(gBrowser.selectedTab);
       yield whenDelayedStartupFinished(win);
       let [tab] = win.gBrowser.tabs;
       let anchor = win.document.getElementById("default-notification-icon");
 
       yield new Promise(resolve => {
+        let originalCallback = notification.options.eventCallback;
         notification.options.eventCallback = function (eventName) {
+          originalCallback(eventName);
           if (eventName == "shown") {
             resolve();
           }
         };
         info("Showing the notification again");
         notification.reshow();
       });