Greasy Fork is available in English.
Shows all pages at once in online view for these sites: Alandal, Asura Scans, Batoto, BilibiliComics, ComiCastle, Comick, Dynasty-Scans, INKR, InManga, KLManga, Leitor, LHTranslation, Local Files, LynxScans, MangaBuddy, MangaDemon, MangaDex, MangaFox, MangaHere, Mangago, MangaHosted, MangaHub, MangasIn, MangaKakalot, MangaNelo, MangaNato, MangaOni, MangaPark, Mangareader, MangaSee, Manga4life, MangaTigre, MangaToons, MangaTown, ManhuaScan, ManhwaWeb, MangaGeko.com, MangaGeko.cc, NaniScans, NineM
The script has been slowing down a lot of my other tabs when I leave it open in the background for too long. I'm not sure what's causing this but I hope you can fix it and make your script more efficient.