text: const REX = /(corona|covid)((-| )?(v(i|í)rus|19))?/gi;
  
  const ignoreTag = ["script", "noscript", "source", "style"];
  
  function vaccinate(element) {
    if (ignoreTag.includes(element.localName)) return;
  
    const text = element.textContent;
  
    if (text) {
      element.textContent = text.replace(REX, "💉");
    }
  }
  
  function findMatche(element) {
    if (!element.childElementCount) vaccinate(element);
    
    else for (el of element.children) findMatche(el);
  }
  
  chrome.runtime.onMessage.addListener(req => {
    if (req.message === "load") findMatche(document.body);
  });
  