Not sure if this will work but try it, it should stop the popup from appearing at all
// ==UserScript==
// @name Block Facebook Tag Suggestions
// @namespace https://github.com/AbdurazaaqMohammed
// @version 1.0
// @author Abdurazaaq Mohammed
// @description Block annoying Facebook tag suggestion popups
// @match https://*.facebook.com/*
// @homepage https://github.com/AbdurazaaqMohammed/userscripts
// @license The Unlicense
// @supportURL https://github.com/AbdurazaaqMohammed/userscripts/issues
// @run-at document-start
// @grant none
// ==/UserScript==
(function() {
'use strict';
document.head.appendChild(document.createElement('style')).innerHTML = '.tag-suggestion-popup {display: none !important;}';
})();
This script will automatically disable the annoying Tag Suggestions pop-up window whenever you're posting or commenting on a facebook post, which drives me bananas whenever I try to type something and get that stupid pop-up with every word I type. Feel free to contact me if you run into any issues.