Sleazy Fork is available in English.
Can work on almost any webcomic/manga page, preloads 5 or more pages ahead (or behind), navigates via ajax for instant-page-change, lets you use the keyboard, remembers your progress, and it's relatively easy to add new sites
Can you post a link of a page where it should work and doesn't?
Doesn't work..oogle
It pops up with the req showing that this is my first time using webcomic and nothing more after that..