Sleazy Fork is available in English.
Download nHentai manga as compression file easily, and add some useful features. Also support some mirror sites.
Currently this script only supports nHentai.
But you can fork it and develop to support other sites if you like.
sadly, I don't have any experience in programming
Is it possible to create the same extension for Akuma.moe?
I need this extension because Akuma.moe does not have a download function like Nhentai, and I cannot find the registration page for Akuma.moe.