SA_replace_read_images.js

// ==UserScript==
// @name read gifs to links
// @description Make gifs in read messages into links on some of Something Awful's image heavy threads
// @include http://forums.somethingawful.com/showthread.php*threadid=3457178*
// ==/UserScript==
/*jslint browser: true, maxerr: 50, indent: 4, plusplus: true */
/* Instead of downloading the 200 megs of gifs that you've already seen,
   it should only download the 20 megs of gifs that you haven't seen yet. (or old gifs someone quotes)
   WORKSFORME WONTFIX
*/
window.addEventListener('DOMContentLoaded', function () {
    "use strict";
    var readImgs = document.querySelectorAll(".post .seen2 .postbody img, .post .seen1 .postbody img"),
        i,
        img,
        a,
        sa_pattern = /https?:\/\/\w*\.?somethingawful\.com\//,
        src;

    for (i = 0; i < readImgs.length; i++) {
        img = readImgs[i];
        if (sa_pattern.test(img.src)) { // skip emoticons and avatars
            continue;
        }
        src = img.src;
        delete img.src;

        a = document.createElement('a');
        a.href = src;

        a.target = '_blank';
        a.appendChild(document.createTextNode(src));
        img.parentNode.replaceChild(a, img);
    }
}, false);