The script you requested has been deleted, but here are some related scripts.
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Eza's Gallery Swallower JS - Turn a page of thumbnails into high-res images
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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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Chicken Mod v1.15 JS - very much so dumb
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RebeLM00D JS - made with rebelhands