How do I track and debug JavaScript memory leaks in Firefox?

Question

I\'ve been trying to track this one for literally a month now without any success. I have this piece of code on an car advertising website which basically allows thumbnails

Answer 1

A way to track memory leaks in Firefox is with the Leak Monitor Addon. It shows memory leaks of javascript (including extension-scripts).

Please remind that the plugin will sometimes show leaked objects that will get cleaned up later by the garbage collection. If that is the case the plugin will launch a new window showing you the new status.

Answer 2

Try nulling elements variable array in the end of the initialize function

    ...

    if (ads.length > 0)
        {
        this.imagesFx = new Fx.Elements(elements,
            {
            wait: false,
            duration: 1000
            });
        this.moveNext.periodical(2500, this);
        }

    elements = null; //Add THIS!
}

Answer 3

Update to MooTools 1.2.1, we've improved garbage collection and leak handling.