const observer = new MutationObserver((mutations) => {
  for (const mutation of mutations) {
    mutation.addedNodes.forEach(node => {
      if (node.nodeType === 1) { // Check if it's an element
        if (node.matches('ul.menu.popup')) {
          node.setAttribute('oncontextmenu', 'return false');
        }
        // Also check if the added node contains the target element
        const nested = node.querySelector('ul.menu.popup');
        if (nested) nested.setAttribute('oncontextmenu', 'return false');
      }
    });
  }
});

observer.observe(document.body, { childList: true, subtree: true });