Damn browser crash...

spot-the-error.js

(function($){
  
  var supports_onhashchange = 'onhashchange' in window,
    last_hash = location.hash,
    timeout_id;
  
  $.event.special.hashchange = {
    setup: function() {
      if ( supports_onhashchange ) { return false; }
      
      start();
    },
    teardown: function() {
      if ( supports_onhashchange ) { return false; }
      
      stop();
    }
  };
  
  function start() {
    var hash = location.hash;
    
    if ( hash !== last_hash ) {
      $(window).trigger( 'hashchange' );
      last_hash = hash;
    }
    
    timeout_id = setInterval( start, 100 );
  };
  
  function stop() {
    clearTimeout( timeout_id );
  };
  
})(jQuery);