Globally Disable Nag modals "Leave Site" "Changes may not be saved" Chrome

Question

How can I globally and PERMANENTLY disable chromes ability to open

"Leave Site?" "Changes may not be saved" popups.

I want to close every tab of every chrome window and I know what I'm doing I don't need the nanny app to prevent my shutdown or get in my way when I'm trying to close out.

I tried tampermonkey scripts for disabling "onbeforeunload" events but they're not stopping this obnoxious behavior from chrome.

Answer 1

1. Install a beforeunload listener before the page does by declaring @run-at document-start in the metadata block.
2. Call stopImmediatePropagation to prevent the subsequently added page listeners from seeing the event.
3. Also clear window.onbeforeunload.

// ==UserScript==
// @name        ignore beforeunload 
// @match       *://*/*
// @grant       none
// @run-at      document-start
// ==/UserScript==

window.addEventListener('beforeunload', e => {
  window.onbeforeunload = null;
  e.stopImmediatePropagation();
});