Fotiman - 8:54 pm on Dec 23, 2009 (gmt 0)

I assume based on your description that "traceback" is the call stack. This information is available in Firebug:

Stack traces unstacked When the debugger is paused, Firebug shows you the call stack, which is the set of nested function calls that are currently running and waiting to return. The call stack is represented as a compact strip of buttons in the toolbar, each with the name of a function on the stack. You can click any button to jump to the line where that function is paused, and look at the local variables inside that function.

Source: [getfirebug.com...]