fresco-disable-mobile.js

/*!
 * Disable Fresco on Mobile Browsers
 * http://www.frescojs.com
 */
(function($) {
  var SUPPORTS_TOUCH = (function() {
    try {
      return !!(('ontouchstart' in window) || 
        window.DocumentTouch && document instanceof DocumentTouch);
    } catch (e) { 
      return false;
    }
  })();

  // don't use this on non-touch devices
  if (!SUPPORTS_TOUCH) return;

  var viewport = (function() {
    // Mobile Safari
    if (!!navigator.userAgent.match(/Apple.*Mobile.*Safari/)) {
      return function() {
        return {
          width: window.innerWidth,
          height: window.innerHeight
        };
      };
    } else {
      // everything else
      return function() {
        return {
          width:  $(window).width(),
          height: $(window).height()
        };
      };
    }
  })();

  $(document).ready(function() {
    $(window).bind('resize orientationchange', function() {
      var vp = viewport(),
          disable = false;

      if ((vp.width <= 568 && vp.height <= 320) || 
          (vp.width <= 320 && vp.height <= 568)) {
        disable = true;
      }

      Fresco[disable ? 'disable' : 'enable']();
    })();
  });
})(jQuery);

Doesn't appear to work with Fresco 2.3.0