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

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 to rotate in search results given that a car has multiple pictures. You can see it in action at the following:

http://www.abcavendre.com/4506691919/

It is built on the mootools 1.2 framework. The problem is that this script, under Firefox 3, consumes a rather large amount of memory overtime when a page is full of those rotating pictures, such as this inventory page:

http://www.abcavendre.com/Vitrine/Israel_Huttman/

You can see the source of the script in question here:

http://www.abcavendre.com/scripts/showcase_small.js

Any ideas as to what is causing the memory leak? The weird thing is this code behaves properly under IE7.

From stackoverflow

• Try nulling elements vairable 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!
  }
  

  Andrew Moore : That wouldn't explain the memory leak happening overtime (with no page refresh) as the initialize function is called only once per page.

  Daniel Silveira : Try it... it won't hurt

  Andrew Moore : I just did, no change.

• 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.

  PhiLho : You missed : after https, so SO makes a curious URL sending to TheEdge... :-)

  Joe Scylla : Fixed. Thank you for reporting ;)

  Matt Ball : Seeing as SO is an English-language site, you might want to provide an English-language link: https://addons.mozilla.org/en-US/firefox/addon/2490

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