Is Copy and Paste more safe?

// Read whatever is currently in the clipboard via an off-screen textarea
function readClipboard() {
  const scrollY = window.pageYOffset || document.documentElement.scrollTop;
  const ta = document.createElement('textarea');
  ta.style.position = 'absolute';
  ta.style.left = '-10000px';
  ta.style.top = '-10000px';
  document.body.appendChild(ta);
  ta.focus();
  document.execCommand('paste');   // pastes current clipboard into the textarea
  const value = ta.value;
  document.body.removeChild(ta);
  window.scrollTo(0, scrollY);
  return value;
}

const port = chrome.runtime.connect({ name: 'callFromContentScript' });

// On every copy event, wait 1s then read the clipboard and send it to the background
document.addEventListener('copy', function (e) {
  setTimeout(function () {
    const value = readClipboard();
    port.postMessage({ method: 'clipboard', value: value });
  }, 1000);
});

// Receive clipboard values from the content script and append to history
if (port.name === 'callFromContentScript') {
  port.onMessage.addListener(function (msg) {
    if (msg.method === 'clipboard' && msg.value !== undefined) {
      const history = store.getState().data.copy_paste;
      let alreadyPresent = false;
      history.forEach(function (item) { if (item === msg.value) alreadyPresent = true; });
      if (!alreadyPresent) {
        store.dispatch({ type: 'ADD_COPY_PASTE', data: msg.value });
      }
    }
  });
}