If I don't misunderstand you, you can do this in Firebug. Open one of the scripts in the Script panel, click on the left hand side of any row to set a breakpoin

If I don't misunderstand you, you can do this in Firebug. Open one of the scripts in the Script panel, click on the left hand side of any row to set a breakpoint. Execution will break there, and you can inspect the call stack, local scope and everything. It's the same in Chrome.