Tampermonkey user script to Block/Remove Ads from Facebook timeline - Working as of 28-10-2021

remove-facebook-ads.user.js

// ==UserScript==
// @name         Remove Facebook Ads
// @namespace    https://gist.github.com/mikhasd
// @version      0.1
// @description  Tampermonkey user script to remove ads from Facebook timeline.
// @author       mikhasd
// @match        https://www.facebook.com/
// @icon         https://www.google.com/s2/favicons?domain=facebook.com
// @grant        none
// ==/UserScript==

const TAG = '[TAMPERMONKEY]'

async function timeout(time){
    return new Promise(resolve => {
        setTimeout(resolve, time)
    })
}

async function findFeedRoot(){
    while(true){
        let feed = document.querySelector('div[role=feed]')
        if(feed){
            return Promise.resolve(feed)
        }
        await timeout(10)
    }
}

(async function() {
    'use strict';
    console.info(TAG, 'initializing Remove Facebook Ads')

    const feed = await findFeedRoot()
    console.info(TAG, 'acquired feed element')

    function findFeedElement(a){
        let el = a.parentElement
        while(el.parentElement != feed){
            el = el.parentElement
        }
        return el
    }

    function cleanAds(){
        const start = performance.now()
        const ads = Array.from(feed.querySelectorAll('a[role][aria-label] > span > span span'))
            .filter(span => span.innerText[0] == 'S')
            .filter(span => {
                const style = window.getComputedStyle(span)
                return style.position === 'relative' && style.display === 'inline'
            })
        const count = ads.length
        if (count == 0 ){
            return
        }

        ads.map(findFeedElement)
            .forEach(el => {
                try{
                    el.remove()
                } catch (e){}
            })
        const end = performance.now()
        console.info(TAG, `removed ${count} ads in ${end - start}ms`)
    }

    const observer = new MutationObserver(cleanAds)

    observer.observe(feed, {
        subtree: true,
        childList: true,
        attributes: false
    });

})();