Memory leaks are detected by the extension Leak Monitor (https://addons.mozilla.org/firefox/2490/) when one uses event ready().

Install it and load pages from jquery.com. It'll pop up this kind of message:

(Leaks in window 0x2d27dd0:

[+] [leaked object] (3d7d950, http://proj.jquery.com/js/jquery.js, 14-14) = function () {

if ($.$$timer) {

clearInterval($.$$timer);

$.$$timer = null;

for (var i = 0; i < $.$$ready.length; i++) {

$.apply(document, $.$$ready[i]);

}

$.$$ready = null;

}

}

[ ] $$guid = 1

[ ] prototype (2c59268) = [object Object]