MinisterIn.js

var isOpen = false;

function updateIcon() {
  chrome.browserAction.setIcon({
  path: isOpen ? {
    48: "icons/o_48x48.png",
    96: "icons/o_96x96.png"
  } : {
    48: "icons/c_48x48.png",
    96: "icons/c_96x96.png"
  }
});
}

function checkStatus(text){
  num = parseInt(text);
  if (num > 0) {
    isOpen = true;
  }else {
    isOpen = false;
  }
  updateIcon();
}

function httpGetAsync(theUrl, callback)
{
  var xmlHttp = new XMLHttpRequest();
  xmlHttp.onreadystatechange = function() {
    if (xmlHttp.readyState == 4 && xmlHttp.status == 200)
      callback(xmlHttp.responseText);
  };
  xmlHttp.open("GET", theUrl, true); // true for asynchronous
  xmlHttp.send(null);
}

function timer(){
  httpGetAsync("https://www.techministry.gr/hackers.txt", checkStatus);
}

httpGetAsync("https://www.techministry.gr/hackers.txt", checkStatus);
setInterval(timer, 300000);