I have a really large table in my page, and, when I scroll to the
bottom of the table - whenever I hover over a <tr> element, Firefox
throws an error at:

too much recursion
[Break on this error] if (observer.call(this, event) === false) {

which is in this function in lowpro.js: (line 165)

<code>
 _wrapObserver: function(observer) {
    return function(event) {
      if (observer.call(this, event) === false) event.stop();
    }
  }
</code>

In IE6 - the browser just crashes. I can't upgrade to IE7 - since I
work for a soul-less investment bank and we are all on IE6