Hello! first post.
I just had to register and pop a thank you message for this ridiculously awesome extension because I nearly returned my touch because I couldn't read mangas as good as the kindle 4 non touch one. Thank god I found this one, took me awhile to actually set it up properly but it is working very well now!
I did actually find a bug, while reading a manga and going to the "reading menu" then "choose folder" I can see duplicate titles not sure if it was fixed though. Picture below.
(Click to enlarge)