jQuery scrolltop firefox not working
Try this fiddle, it is working in chrome, ie and the latest version of mozilla : http://jsfiddle.net/Hed2J/3/
I replace $('body').scrollTop() with $(window).scrollTop().
A little off-topic, but if you want to animate using scrolltop, you must do
$('html,body').animate({scrollTop:0}, 'slow');
Note that we target both html and body because html will make scroll in Firefox works and body for other browsers.