removeFacebookAdsNew.user.js

// ==UserScript==
// @name         Goodbye new FB ads
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Remove facebook ads
// @author       Maurizio Carboni
// @match        https://www.facebook.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    function realText(elem) {
        if (elem instanceof Text) {
            return elem.textContent;
        }
        const visibleText = [...elem.childNodes]
        	.filter(elem => elem instanceof Text || window.getComputedStyle(elem, "").display !== 'none')
        	.flatMap(elem => realText(elem))
        	.join('')
        return visibleText
    }
    function isSponsored(elem) {
        return elem && realText(elem).toLowerCase().startsWith('sponsored')
    }
    function isArticleSponsored(elem) {
        return isSponsored(elem.querySelector('div[id^=feed_subtitle]'))
    }
    const domInsertionObserver = new MutationObserver(function(mutationsList){
        [...mutationsList]
            .filter(mutation => mutation.type === 'childList' && mutation.addedNodes.length)
            .flatMap(mutation => [...mutation.addedNodes])
            .filter(addedNode => typeof addedNode.id === 'string' && addedNode.id.startsWith('u_fetchstream'))
            .filter(isArticleSponsored)
            .forEach(post => post.parentElement.removeChild(post))
    });
    domInsertionObserver.observe(document, { childList: true, subtree: true });

    function getSponsoredPosts() {
        const sponsoredArticles = [...document.querySelectorAll('[role=article]')]
        .filter(isArticleSponsored)
        return sponsoredArticles;
    }

    setTimeout(function() {
        // Remove the first one (is added without ajax)
        getSponsoredPosts().forEach(post => post.parentElement.removeChild(post))
    }, 3000);
})();

must have worked 48hours I guess, installed today, already broken, they must have changed something this week-end