JavaScript for browser console kills on page iframes + uses MutationObserver to kill new iframes

iframe_killer.js

(function () {

  function __kill_added_iframe_mutob_callback(mList, ob){
    const addedNodesToRemove = []
    mList.forEach(mRec => {
      mRec.addedNodes.forEach(addedNode => {
        if (addedNode.tagName.match(/^iframe$/i)) {
          addedNodesToRemove.push(addedNode)
        }
      })
    })
    addedNodesToRemove.forEach(nodeToRemove => {
      console.log('removing 1 ' + nodeToRemove.tagName)
      nodeToRemove.remove()
    })
  }

  const __kill_added_iframe_mutob = new MutationObserver(__kill_added_iframe_mutob_callback)
  __kill_added_iframe_mutob.observe(document.body, {
    attributes: false, 
    childList: true, 
    subtree: false
  })
  window.__kill_added_iframe_mutob = __kill_added_iframe_mutob

  // init
  document.querySelectorAll('iframe').forEach(iframe => iframe.remove())

})();