Sleazy Fork is available in English.
Shows all pages at once. Single/Multi page spread.Example sites: All FoOl(Slide/Reader), MangaFox, MangaReader/MangaPanda, MangaStream, MangaInn, AnyManga, AnimeA, MangaHere, MangaShare, Batoto, MangaDevil, MangaCow, MangaChapter, 7manga, MangaPirate.net, Madokami , SpinyBack, MyManga , KawaiiScans, EGScans, All SenManga,LoneManga ,ReadManga,MangaTraders,MangaCat,KissManga, MangaJoy,MangaBee/OneManga.me, KukuDM, Japscan, Pecintakomik, Sh-Arab, some Portuguese sites. Dl addon for 18+ sites.
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It's down right now. I'll look into it when it's back up
Finally up and I've fixed it.
http://spinybackmanga.com new reader
http://spinybackmanga.com has a new reader which breaks the current script