title: Is it possible to follow JavaScript in real-time?
body: <p>I would like to see what the JavaScript interpreter is doing in real-time, which line it is reading and which function it is running, because I would like to make a full debug on every little piece of the JavaScript to make it faster. For this I need some tool to tell me what the interpreter is doing exactly, if it is defining a variable, if it's running a function, if it's in a loop, check the current intervals (defined in <code>setInterval</code>).</p>
  
  <p>As far as I know Firebug can't do that.</p>