You'll need a chat activity, 2 users and 2 browsers ie Firefox and chrome. As user 1 check that you're messaging preferences are to receive personal message notifications (online and offline) via popup. Go to a chat activity. Its the page with "click here to enter chat now" etc. Go your other browser, log in as another user and send the first user a personal message. Return to the first user. Click "click here to enter now". A chat window will pop up. No messaging notification should be displayed. Close the chat window. Click "Use more accessible interface". The non-ajax chat window will pop up. No messaging notification should be displayed. Close the chat window. Refresh the chat activity (or return to the course page). You should now get a messaging popup notification in the bottom right of the screen.