Say I need to develop a web site for multiple browsers. major ones - Firefox, Safari, IE, Opera, Chrome
How do you debug display issues? In Firefox there's Firebug, which is great. There also is a Firebug Lite for other browsers, but it's not full featured - it does not refresh in real-time. For example, if I suspect that jQuery is slowing it down (adding classes, etc), how would I find out?