Reddit.user.js

// ==UserScript==
// @name Remove Promoted Reddit Posts
// @namespace /
// @version 2.0
// @description try to take over the world!
// @author You
// @match /\*
// @grant none
// ==/UserScript==
(function() {
'use strict';
const promotedPosts = document.getElementsByClassName('promotedlink');
let totalPosts = 0;
const hidePromotedPosts = () => {
alert(1)
if (promotedPosts.length === totalPosts) return;
totalPosts = promotedPosts.length;
Array.from(promotedPosts).forEach((post) => {
post.style.display = 'none';
});
};
hidePromotedPosts();
document.body.addEventListener('DOMNodeInserted', hidePromotedPosts);
})();