Makes Instagram preview images full-sized
UPDATE: The script doesn't work at the moment, and instead you should just use the SaveFrom.Net UserScript.
This script will allow you to easily grab full-sized images from an Instagram feed; unfortunately, it does not distinguish between picture and video posts, and in the latter case, it will let you grab the full-sized thumbnail preview. It also puts an Info link below each image, so that you can see the comments (and in the case of a video post, the actual video), and a Download link, so you can directly download the full-sized image with a click.