At first I was worried that I simply had “too many elements” and jquery was dying on me. Then I found out that Firebug causes problems on firefox. All animations are very heavy and “low-frame-rate”.
It works just fine on Konqueror. I can only hope its fine otherwise : ).
Who uses firebug anyways? The same very small crowd who might turn off javascript.
Yuji Tomita 
I do =) is very usefull, im using xajax, and firbug save my life.