Just copy & paste this code or download the file and put it in tampermonkey as a new script.

// ==UserScript==
// @name         Better XKCD
// @namespace    *://xkcd.com/
// @version      0.1
// @description  Adds the click-text to the screen!
// @author       SealProgrammer
// @match        *://xkcd.com/*
// @match        *://what-if.xkcd.com/*
// @exclude      *://xkcd.com/archive/
// @icon         https://www.google.com/s2/favicons?sz=64&domain=tampermonkey.net
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    const comic = document.getElementById('comic');
    const comics = document.getElementsByClassName('illustration');
    if(comic) {
        let p = document.createElement('p');
        p.append(comic.children[0].title);
        comic.append(p);
    } else if(comics) {
        for(let i=0;i<comics.length; i++) {
            let c = document.createElement('center');
            let ital = document.createElement('i');
            ital.style.fontSize = "small";
            ital.append('"' + comics[i].title + '"');
            c.append(ital);
            comics[i].parentElement.insertBefore(c, comics[i].nextSibling);
            comics[i].parentElement.insertBefore(document.createElement('br'), c.nextSibling)
        }
    }
})();