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onunload event of JAVASCRIPT not work in Linux Firefox

Can you help me with this problem . I am using Modzilla Firefox in Linux . When I close the window or reload the page the onunload event sees not work

<html>
  <head>

    <title>onunload test</title>

    <script type="text/javascript">
     window.onunload = unloadPage;

      function unloadPage()
      {
        alert("unload event detected!");
      }
  </script>
 </head>

 <body>
     <p>Reload a new page into the browser<br />
     to fire the unload event for this page.</p>
     <p>You can also use the back or forward buttons<br />
     to load a new page and fire this event.</p>
</body>

Try this code snippet :

window.onbeforeunload = function(){
      return 'Are you sure you want to leave?'; // or anything you want to do
      };

try to use jQuery libraries, because jquery consider different kinds of browser i think :)

$( window ).unload(function() {
    alert( "unload event detected!" );
});

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