That's very weird. I used the file-checker like you wanted and it clearly showed them all to be down. I don't know what to do in the future then, I don't think I made any mistake now. FF said the files were removed due to content breaking their rules, I think. Did FF re-upload them again then?
I think they're trying to implement a system that blocks files for all but the uploaders if they match a certain hash. But this being FF, they can't get it done right and switch back-and-forth several times now.
Sorry if interrupt, but do you upload comics? If yes, can you please upload this comic, author uploaded it on fanbox, but fanbox delete almost all posts, and kemono stop working in the same time, and almost 2 years i try to find it somewhere else, but useless, Thanks in advance, and sorry for bad english.