Create a new bookmark in your bookmark toolbar. Set the name to "Goblin Spy Replays". Set the bookmark location to:
javascript:(function() {
div = document.createElement('div');
div.setAttribute('style', 'position: absolute; right: 10px; top: 10px; background: #fff; color: #000');
div.setAttribute('id', 'replays');
ul = document.createElement('ul');
div.appendChild(ul);
existing = document.getElementById('replays');