title: How can you debug JavaScript which hangs the browser?
body: <p>I'm working on a substantially large rich web page JavaScript application. For some reason a recent change is causing it to randomly hang the browser.</p>
  
  <p>How can I narrow down where the problem is? Since the browser becomes unresponsive, I don't see any errors and can't <code>Break on next</code> using FireBug.</p>