https://gist.github.com/0xBADDCAFE/cbaaa17cd75805d32b72fa4284dc83a6/raw/noadtimeline.user.js

noadtimeline.user.js

// ==UserScript==
// @name         NoAd Timeline
// @namespace    http://0xbd.cf/
// @version      0.1
// @description  display:none; for Ad
// @author       0xBADDCAFE
// @match        https://twitter.com/*
// @grant        none
// ==/UserScript==

const pastNodes = [];

function displayNoneIfAd(article){
    let sibling = article.querySelector("[role=group]");
    if (!sibling) return;
    if (sibling.nextSibling) {
        var parent = sibling.parentNode;
        while (parent.tagName != "ARTICLE") {
            parent = parent.parentNode;
            if (!parent) return;
        }
        if (parent.getBoundingClientRect().top > 0) {
            parent.style.display = "none";
            console.log("Dismiss Ad");
            console.log(parent);
        }
    }
}

(function() {
    'use strict';

    new MutationObserver((mutationsList) => {
        for (var mutation of mutationsList) {
            if (mutation.type === "childList") {
                for (var node of mutation.addedNodes) {
                    if (node.querySelectorAll) {
                        let articles = node.querySelectorAll("[data-testid^=tweet]");
                        for (var article of articles) {
                            if (article && !pastNodes.includes(article)) {
                                pastNodes.push(article);
                                displayNoneIfAd(article);
                            }
                        }

                    }
                }
            }
        }
    }).observe(
        document,
        { childList: true, subtree: true }
    )

})();