Using Javascript MutationObserver

MutationObserver.js

//More Details https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver
//Will not work if more then one lookup is used on same page
//Please remove all comments for live 
//Add Mututationobserver on selected component
$("#component-abca-2a71-4474").on("click",".search_for_salesforce_record,.lookup_salesforce_record ", function() {
   new MutationObserver(function(mutations) {
      // Do something here
      if($('#component-abca-2a71-4474 .found_record_list li') && $('#component-abca-2a71-4474 .found_record_list li').length > 0) {
         //Add css to change  for lookup result
         $('#component-abca-2a71-4474 .found_record_list li').append('<span class="glyphicon glyphicon-hand-up"></span><style>#select_icon{display:none}.found_record_list #select_icon{display:inline}</style>');
          // Stop observing if needed:
          this.disconnect();
       }

      if($('#component-abca-2a71-4474 .found_record_list').text()=='No records found'){
        //Add css to change  for Default message
        $('#component-abca-2a71-4474 .found_record_list').text('Please try Again ... :)'); 
          // Stop observing if needed:
          this.disconnect();
       }
       // Stop observing if needed:
       this.disconnect();
   }).observe(document.querySelector('#component-abca-2a71-4474 .found_record_list'), {childList: true});
})