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)
Updated domains in the new version, but there seem to be some issues with images not loading properly every once in a while, I'll look into it when I have time.
https://greasyfork.org/en/scripts/692-manga-loader/diff?v1=196233&v2=175517
Change Domain
Mangamint.com => http://www.mangatail.com/
= > http://www.mangasail.com/
sample link = http://www.mangatail.com/chapter/robot-x-laserbeam-03
http://www.mangasail.com/content/kingdom-512