However, only Firefox and Internet Explorer allow the 'Metadata Window' to appear above the main browser window after the first request. Click here to test

Safari only works if you double click the selected link and there is no faculty for this function on Google Chrome. What is more, to allow this function on Firefox you must first perform the following operation:

Open Tools > Options… > Content tab >Advanced button next to “Enable JavaScript” >check the box named "Raise or Lower Windows"