Greasy Fork is available in English.
Shows all pages at once in online view for these sites: Alandal, Batoto, BilibiliComics, ComiCastle, Comick, Dynasty-Scans, INKR, InManga, KLManga, Leitor, LHTranslation, Local Files, LynxScans, MangaBuddy, MangaDex, MangaFox, MangaHere, Mangago, MangaHosted, MangaHub, MangasIn, MangaKakalot, MangaNelo, MangaNato, MangaOni, MangaPark, Mangareader, MangaSee, Manga4life, MangaTigre, MangaToons, MangaTown, ManhuaScan, MangaGeko.com, MangaGeko.cc, NaniScans, NineManga, OlympusScans, PandaManga, RawD
< Feedback on Manga OnlineViewer
This script doesn't have an option to limit pages loaded yet so it will load everything. There is also a version that allows for viewing as double page spread on this site which can search for(shameless advertising :p)
Can Manga onlineviewer loads all pages?
Can Manga onlineviewer script loads all pages at a time instead of maxium pages loaded is 10?