Animation Task Manager, for Firefox older than its version 57.

This project is obsolete and not maintained anymore.

Usage:

window['piro.sakura.ne.jp'].animationManager.addTask(
  function(aTime, aBeginningValue, aTotalChange, aDuration) {
    // some animation task runned by interval
    var current = someEasingFunction(aTime, aBeginningValue, aTotalChange, aDuration);
    target.style.left = current+'px';
    return aTime > aDuration; // return true if the animation finished.
  },
  100, // beginning
  200, // total change (so, the final value will be 100+200=300)
  250, // msec, duration
  window // the window (used by Firefox 4 animation frame API)
);
// stop all
window['piro.sakura.ne.jp'].animationManager.stop();
// restart after doing something
window['piro.sakura.ne.jp'].animationManager.start();