The script you requested has been deleted, but here are some related scripts.
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Douki JS - Import Anime and Manga Lists from Anilist (see https://anilist.co/forum/thread/2654 for more info)
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Anime Website (Custom) Buttons Plus JS - A script that adds buttons on Anime Planet, MAL, Kitsu, Anilist and aniDB for searching various sites.
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All the anime top buttons JS - All the anime top buttons (has MAL-Sync support)
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Generate a List With The Animes/Mangas Titles that were Re-Watched/Re-Read JS - Easily and quickly generate a list with all ReWatched/ReRead entries and how many times.