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
Don't work with opera new version(Opera 34) - violent monkey
It worked well but recently stop working. I tried to test some other scripts to see if it's my browser or extension that's wrong but it turned out that other script work fine, only mangaloader have problem (and mangaloader NSFW too)