Remove suspicious click events to avoid first click ads.

userscript.js

// ==UserScript==
// @name         New Userscript
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://mail.google.com/mail/u/0/#inbox
// @grant        none
// ==/UserScript==

function removeSuspiciousClickEvents(target) {
    const events = getEventListeners(target);
    if (events.click) {
        events.click.forEach(function (e) {
            target.removeEventListener("click", e.listener, false);
        });
    }
    if (events.mousedown) {
        events.mousedown.forEach(function (e) {
            target.removeEventListener("mousedown", e.listener, false);
        });
    }
    if (events.mouseup) {
        events.mouseup.forEach(function (e) {
            target.removeEventListener("mouseup", e.listener, false);
        });
    }
}

(function() {
    'use strict';

    window.addEventListener('load', function() {
        removeSuspiciousClickEvents(document);
        removeSuspiciousClickEvents(document.body);
        removeSuspiciousClickEvents(window);
    }, false);

})();

getEventListeners(target) give me an error "ReferenceError: getEventListeners is not defined"

Because getEventListeners is only available when using DevTools