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From a different thread, this one supposedly auto expands images:

// ==UserScript==
// @name    Expand Images
// @match   https://burggit.moe/*
// ==/UserScript==

// Permission to use, copy, modify, and/or distribute this software for
// any purpose with or without fee is hereby granted.

// Start the script
poll();

function poll() {
  expand();
  setTimeout(poll, 200);
}

function expand() {
  const posts = document.querySelectorAll("div.post-listing");
  for (const post of posts) {
    const imgThumbnail = post.querySelector("button.thumbnail");
    const isImage = imgThumbnail !== null;
    const isExpanded = post.childElementCount > 2;
    if (isImage && !isExpanded) {
      imgThumbnail.click();
    };
  }
}