//text shown on the chrome extension popup
function func(obj){
  document.querySelector("#io").innerHTML = obj[0].key1;
}

var queryInfo = {
    active: true,
    currentWindow: true
  };

chrome.tabs.query(queryInfo, function(tabs){
  var tab = tabs[0];
  tab_title = tab.title;
  chrome.tabs.executeScript(tab.id, {
    code: 'var OBJ =  {key1: document.querySelector("div_1").textContent, key2: document.querySelector("div_2").textContent}; OBJ'}
    ,func);
});