title: Javascript:alert('...') - Error: uncaught exception: ReferenceError: alert is not defined
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/6643414/javascript-alert-not-working-in-firefox-6">JavaScript alert not working in Firefox 6</a>  </p>
  </blockquote>
  
  
  
  <p>I often execute Javascript code in the address bar (mostly for debugging and testing):
  javascript:alert(some_function_with_interesting_return_value('blah'));
  Or - more obvious:
  javascript:alert('interesting value');</p>
  
  <p>This doesn't seem to work anymore with Firefox 6:
  Error: uncaught exception: ReferenceError: alert is not defined</p>
  
  <p>How is it possible for alert() not to be defined ?</p>
  
  <p>I've double-checked it with Firefox 5, Epiphany, Midori and Chromium - works fine.</p>