Greasy Fork is available in English.
Support for over 70 sites! Loads manga chapter into one page in a long strip format, supports switching chapters, minimal script with no dependencies, easy to implement new sites, loads quickly and works on mobile devices through bookmarklet
< Feedback on Manga Loader (unmaintained)
I would also like to add that mangakaka site was changed to http://www.mangahen.com/
the first page also repeats and cuts off the last page of the chapter
Fixed in v1.9.7 (hopefully).
Mangacow changed domain to http://mngcow.co/
the first page also repeats