The script you requested has been deleted, but here are some related scripts.
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Yande.re Masonry JS - Yande.re/Konachan Masonry(Waterfall) Layout. Also support danbooru/gelbooru/rule34/sakugabooru/lolibooru/safebooru/3dbooru/xbooru/atfbooru/aibooru et cetera.
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Image Board Enhancer (Rule34, Gelbooru, e621, and more) JS - Auto Resize images and video on multiple image boards and enlarges thumbnails on mouse hover and adds content type icons to them.
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Handy Image JS - Shows just fullsize Image with hotkeys & without pop-ups on many image-hosting sites
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Booru Downloader + Viewer JS - The original fullsize images downloader, and viewer for more than 20 booru imageboards