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
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Can't you use arrow keys or Page Down/Up? I have read on my laptop with arrow keys its quite fine, you may wanna disable smooth scrolling if you prefer.
[Request]Hotkeys for jumping to the next page/image
It's really not that big of an issue, but it would appreciated as it's a bit inconvenient scrolling on a laptop without a mouse.