What's the Browser Distribution for your site?
jeresig: http://jquery.com/3.3mil visitors / 1.57mil uniques (for this last 30 days)    Firefox	61.51% 	
    IE		15.60% 	
    Safari	10.89% 	
    Chrome	7.56% 	
    Opera	3.15% 	
    Mozilla	1.02% 	

All else less than 0.06%