examples/sample.js.debug/scripts/script.js

var test = function() {
  var clazz = Packages.javascript.dummy.Activator;
  return clazz.TEST;
};
var v = test();
debugger;

var y = test();

var z = test();

var test2 = function() {
	debugger;
	var clazz = Packages.javascript.dummy.Activator;
	return clazz.TEST;
};