Ways to hack setTimeout and setInterval to help debug lingering timers.

timerdebug.js

(function () {
  var oldSetTimeout = GLOBAL.setTimeout;
  GLOBAL.setTimeout = function () {
    var e = new Error('Just for stack trace');
    console.log('New timeout registered from %s', e.stack);
    return oldSetTimeout.apply(this, arguments);
  };
  var oldSetInterval = GLOBAL.setInterval;
  GLOBAL.setInterval = function () {
    var e = new Error('Just for stack trace');
    console.log('New interval registered from %s', e.stack);
    return oldSetInterval.apply(this, arguments);
  }
})();

setTimeout(function () {
  console.log('Timeout fired');
}, 1000);