Remove the cursor-chasing cat oneko on basically any site. Userscripts / Tampermonkey compatible.

deleteDatCat.user.js

// ==UserScript==
// @name        deleteDatCat
// @description Removes the cursor chasing cat oneko from basically any website.
// @match       *://*/*
// ==/UserScript==

(() => {
  const deleteDatCat = () => document.getElementById('oneko')?.remove();
  deleteDatCat();
  new MutationObserver(nuke).observe(document.body, { childList: true, subtree: true });
  document.addEventListener('visibilitychange', () => document.visibilityState === 'visible' && deleteDatCat());
})();