Sleazy Fork is available in English.
Loads manga chapter into one page in a long strip format, supports switching chapters and works for a variety of sites, minimal script with no dependencies, easy to implement new sites, loads quickly and works on mobile devices through bookmarklet
< Feedback on Manga Loader NSFW (unmaintained)
I checked this and this script is broken for me as well on this site. Button shows up but does nothing.
doesn't load for doujins.com
Ever since doujin-moe reformed into doujins.com, the script has never worked for me.