If you run the following, you get one messagebox open in Chrome, and a LOT open in Firefox:

jQuery(document).scroll(function(){

alert(jQuery(window).scrollTop());

});

I've created a demo here:  http://jsfiddle.net/captainmorgan/cVsRE/1/  

Open in Chrome and scroll down with the mouse wheel. I get 100. When I do the same thing in Firefox I get 114, but Firefox continues to display multiple messageboxes and the number keeps decreasing. Does anyone know why Firefox does this?