I have a large page (selects with several thousands of options loaded with xmlhttprequests)

I had some problems with this page because everytime it was unloaded firefox would hang(not responing, no window repainting, etc) for 10-20 seconds.

And sometimes come up with the alert for javascript running to loong.

I tracked the problem to this:

Prevent memory leaks in IE

And prevent errors on refresh with events like mouseover in other browsers

// Window isn't included so as not to unbind existing unload events

jQuery(window).bind("unload", function() {

jQuery("*").add(document).unbind();

});

When uncommenting theses lines everything started running smoothly.