Chrome extension for saving top visited sites in Google spreadsheet

popup.js

var settings;
var email;
var id;

loadSavedSettings();

function loadSavedSettings() {
  
  // buttonSettings
  if (!window.localStorage.buttonSettings) {
    window.localStorage.buttonSettings = JSON.stringify({ "showURLs": true, "openInActiveTab": false });
  }
  settings = JSON.parse(window.localStorage.buttonSettings);

  settings["showURLs"] = true;
}

// Event listener 
function onAClick(event) {
  if(!settings.openInActiveTab){
     chrome.tabs.create({ url: event.srcElement.href }, function(tab) {window.close();});
  } else {
    chrome.tabs.query({currentWindow: true, active: true}, function(tab) {
      chrome.tabs.update(null, { url: event.srcElement.href }, function(tab) {window.close();});
      
    });
  }
  return false;
}

function saveInTrix(mostVisitedURLs){

  var iframe = document.createElement("iframe");
  iframe.setAttribute("name", "iframe");
  iframe.setAttribute("style", "display:none;");
  iframe.setAttribute("type", "hidden");

  var input = document.createElement("input");
  input.setAttribute("type", "hidden");
  input.setAttribute("name", "data");
  input.setAttribute("value", JSON.stringify(mostVisitedURLs));

  var input2 = document.createElement("input");
  input2.setAttribute("type", "hidden");
  input2.setAttribute("name", "email");
  input2.setAttribute("value", email);

  var form = document.createElement("form");
  form.setAttribute("id", "tubs");
  form.setAttribute("method", "post");
  form.setAttribute("target", "iframe");
  form.setAttribute("action", INSERT_SCRIPT_URL_HERE);

  document.body.appendChild(iframe);
  document.body.appendChild(form);
  form.appendChild(input);
  form.appendChild(input2);

  document.forms["tubs"].submit();
}

// The LI elements
function createMenu(mostVisitedURLs) {
  var mnuDiv = document.getElementById('mnu');
  var ul = mnuDiv.appendChild(document.createElement('ul'));


  saveInTrix(mostVisitedURLs);


  for (var i = 0; i < mostVisitedURLs.length; i++) {

    console.log(mostVisitedURLs);

    var li = ul.appendChild(document.createElement('li'));
    var a = li.appendChild(document.createElement('a'));
    a.href = mostVisitedURLs[i].url;
    
    a.appendChild(document.createTextNode(mostVisitedURLs[i].title));
    
  if(settings.showURLs){  
    a.appendChild(document.createElement("br"));
    res = mostVisitedURLs[i].url;
    res = res.substring(0, 50);
    if(res != mostVisitedURLs[i].url){
       res=res+'...'; 
    }
    a.appendChild(document.createElement("span")).appendChild(document.createTextNode(res));
  }
    a.addEventListener('click', onAClick);
  }
}



chrome.identity.getProfileUserInfo(function(info){
  email = info.email;
  id= info.id;
  chrome.topSites.get(createMenu);
})