show_title_text.js

// ==UserScript==
// @name         Show Image Alt Text
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  https://www.reddit.com/r/chrome_extensions/comments/qhpcw4/looking_for_an_extension_that_will_always_show/
// @author       You
// @match        http*://*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Your code here...
    Array.from(document.querySelectorAll('img')).forEach(img => {
        const text = img.getAttribute('title') || img.getAttribute('alt');
        if (!text) return;

        const el = document.createElement('div');
        const rect = img.getBoundingClientRect();
        el.innerText = text;
        el.style = `
            position: absolute;
            top: ${rect.top+rect.height}px;
            left: ${rect.left}px;
            display: ${window.getComputedStyle(img).display || 'inline-block'};
            padding: 3px;
            background-color: rgba(255,255,255, .4);
            color: black;
            max-width: ${rect.width}px;
            font-size: 12px;`
        img.after(el);
    })
})();