Mutation Observer

If you want to listen to DOM Mutations then you can use the Mutation Observer.

const observer = new MutationObserver((mutations) => {
  mutations.forEach(function(mutation) {
    for (let i = 0; i < mutation.addedNodes.length; i++) { // i.e., nodeList
      console.log(mutation.addedNodes[i]);
      // You can perform your actions here.
    }
  });
});
observer.observe(document.body, {
  childList: true,
  subtree: true,
  attributes: false,
  characterData: false,
});