How can I get break on runtime exception(or error) in javascript (or ecmascript?)

Question

How can I break on error?

I have a code:

throw new Error("Some error");

And I'm using most recent version of Web Inspector (Webkit) and Firebug(Mozilla). These tools catch and print the error, but does not break. May I don't know the how to. Please let me know how can I to do these?

Answer 1

I redefined Error to get solution.

    var Error   =   function(v)
    {
        console.trace();
        console.debug(v);
    }

This solved my problem.

Answer 2

In WebKit you need to click this to enable break on error. If you click it again it will also break on warnings and clicking it again will disable it.