inject.js

chrome.extension.sendMessage({}, function (response) {
  var readyStateCheckInterval = setInterval(function () {
    if (document.readyState === "complete") {
      clearInterval(readyStateCheckInterval);

      console.log("TP Copy extension now works!");

      setInterval(function () {
        if (!document.getElementById('copybaba')) {
          if (document.querySelector('.ui-title')) {
            var title = document.querySelector('.ui-title');
            var btn = document.createElement('button');
            btn.id = 'copybaba';
            btn.textContent = 'Copy!';
            btn.addEventListener('click', function (el) {
              var textArea = document.createElement('textarea');
              textArea.style.position = 'absolute';
              textArea.style.top = '0';
              textArea.style.left = '-10000px';
              textArea.value = Array.prototype.slice.call(document.querySelectorAll('.ui-title td')).map(function (el) {
                return el.textContent
              }).join(' ').replace(/#/, ' #');
              document.body.appendChild(textArea);
              textArea.select();
              document.execCommand('copy');
              textArea.parentNode.removeChild(textArea);
            });
            document.querySelector('.ui-title').insertBefore(btn, title.firstChild);
          }
        }
      }, 500);
    }
  }, 10);
});