How to get firebug to break on exception?

Question

I\'m using Firebug 1.5.4. When I reference an undefined variable or some such, it breaks right where the problem occurs, and throws me into the debug view where I can see t

Answer 1

The respondent was helpful but neglected something very key I was missing; the window.onerror event. Here is the full code:

 window.onerror = function(msg) {
   debugger;
 }