Windows, Mac, and Linux: The Flickr Snap Greasemonkey script adds a thumbnail of Flickr images next to links to Flickr photos or set pages. This script works sort of like the Flickr photo thumbnails on del.icio.us, except that it's integrated globally. I've already gotten some great use out of this script here on Lifehacker posts, like in the comments of our recent make your own motivational poste