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
Add this site please
http://www.douluodalu.com.cn/manhua/
i tried to add it myself but i have no idea what im doing
been using this script for several years and still love it :D