IdleBlur.js

javascript:(function(){
  var delay=10000, intensity=10, timer;
  function resetTimer(){clearTimeout(timer); timer = setTimeout(blur, delay);}
  function activity(){document.documentElement.setAttribute('style',''); resetTimer();}
  function blur(){document.documentElement.setAttribute('style', 'filter:url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'blur\'><feGaussianBlur stdDeviation=\''+intensity+'\' /></filter></svg>#blur");-webkit-filter:blur('+intensity+'px);filter:blur('+intensity+'px);');}
  ['mousemove', 'keypress', 'scroll'].forEach(function(e){document.addEventListener(e, activity, false);});
  resetTimer();
})();void(0);