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Hanging Firefox
Posted by Erik on Jan 04 2006 @ 11:10 :: 3166 unique visits
Just put this code in a page and press the Ok button 3 times very fast. On my machine firefox just hangs and does nothing.CODE: HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>Crash FireFox</title>
</head>
<body>
<script language="javascript" type="text/javascript"><!--
document.onfocus = function() {
alert('click me fast...');
}
//--></script>
</body>
</html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>Crash FireFox</title>
</head>
<body>
<script language="javascript" type="text/javascript"><!--
document.onfocus = function() {
alert('click me fast...');
}
//--></script>
</body>
</html>
It has something to do with the onfocus because this way it doesn't work:
CODE: JAVASCRIPT
function test() {
alert('click me fast...');
test();
}
test();
alert('click me fast...');
test();
}
test();
This code is only very irritating because it won't let you close firefox, except with the taskmanager.
6 comments posted so far
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2. On Jan 04 2006 @ 16:43 guest wrote:
It's pretty obvious why it happens: whenever you click 'ok' the alert dialogue loses focus and the document regains it - hence, 'onfocus' is called for the body element. Rinse and repeat.3. On Jan 04 2006 @ 17:33 Erik wrote:
that is right 2e guest only why doesn't it hang with the second script which also keeps on displaying the alert message box?4. On Jan 06 2006 @ 20:39 guest wrote:
That's an interesting point. I'm not sure!5. On Mar 18 2009 @ 09:51 guess wrote:
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1. On Jan 04 2006 @ 15:57 guest wrote:
If you turn off the javascript enable button in firefox, you could avoid being face with this malicous code.