```   `(function() {
        var originalPostMessage = window.postMessage;

        var patchedPostMessage = function(message, targetOrigin, transfer) {
        originalPostMessage(message, targetOrigin, transfer);
        };

        patchedPostMessage.toString = function() {
        return String(Object.hasOwnProperty).replace('hasOwnProperty', 'postMessage');
        };

        window.postMessage = patchedPostMessage;
    })();

    function sleep(ms) {
        return new Promise(resolve => setTimeout(resolve, ms));
      }
      var allElements = [];
      var lastScrollHeight = 0;
      var count = 0;
      var lista_gruba = [];

      console.log("ready!");
      doit();


      function arrayContains(needle, arrhaystack)
      {
          return (arrhaystack.indexOf(needle) > -1);
      }

      function tryToAddUniqueElements() {
          var elementy = document.getElementsByClassName('_9AhH0');
          for (var i = 0, len = elementy.length; i < len; i++) {
              var ahref = elementy[i].parentNode;
              var img = ahref.firstChild.firstChild;
              var b = ahref.parentNode;
              var url = b.getAttribute('href');
              var media = img.getAttribute('srcset');
              if (media != null) {

                  //console.log(media);

                  media = media.split(' ')[0];
                  if (!arrayContains(url, allElements)) {
                      allElements.push(url);
                      lista_gruba.push({'url': url, 'media': media})
                  } else {
                      console.log(false);
                  }
              }
          }
      }


      async function doit() {
          while (true) {
              var sh = document.documentElement.scrollHeight;


              if (sh != lastScrollHeight) {
                  lastScrollHeight = sh;
                  document.documentElement.scrollTop = sh;
                  count = 0;
                  tryToAddUniqueElements();
              } else {
                  count += 2;
                  console.log(count)
                  if (allElements.length > 50) {
                      console.log("Warunek ilosciowy");
                      console.log(allElements);
                      console.log(lista_gruba);
                      break;
                  }
                  if (count > 20){
                      console.log("Warunek czasowy");
       ```