The script you requested has been deleted, but here are some related scripts.
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Manga Loader NSFW (unmaintained) JS - Loads manga chapter into one page in a long strip format, supports switching chapters and works for a variety of sites, minimal script with no dependencies, easy to implement new sites, loads quickly and works on mobile devices through bookmarklet
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Let's panda! JS - A login, view, download tool for exhentai & e-hentai
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Eza's Gallery Swallower JS - Turn a page of thumbnails into high-res images
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[E/Ex-Hentai] AutoLogin JS - E/Ex - Shared account login, automatic cookie retrieval, manual cookie input, local backup, and backup viewing, automatic login detection