title: Firefox not deleting cookies
body: <blockquote>
    <p>The time the cookie expires. This is a
    Unix timestamp so is in number of
    seconds since the epoch. In other
    words, you'll most likely set this
    with the time() function plus the
    number of seconds before you want it
    to expire. Or you might use mktime().
    time()+60*60*24*30 will set the cookie
    to expire in 30 days. <strong>If set to 0,
    or omitted, the cookie will expire at
    the end of the session (when the
    browser closes)</strong>.</p>
  </blockquote>
  
  <p>Taken from:- 
  <a href="http://www.php.net/manual/en/function.setcookie.php" rel="nofollow">http://www.php.net/manual/en/function.setcookie.php</a></p>
  
  <p>Can anyone explain why is FireFox not deleting cookies with an unspecified expiry time on exit?</p>
  
  <p>I've tested in <strong>Chrome, Opera and IE</strong> they all delete those cookies at exit.</p>
  
  <p>Is this a Firefox bug?</p>