Grab all thumbnails, from any gallery page, and turn them into high-res images. Every image links to itself, for easy bulk downloading or opening in new tabs. Removing individual images or whole submissions takes one click. Just add this userscript and click Swallow Gallery.
Also works on Pixiv, Gelbooru, e621 / e926, Hentai Foundry, Paheal Rule 34, Baraag, Derpibooru, and every board on Booru.org. It is an incredibly efficient tool for wasting time.