>>72637
Actually I still never even found out what was the right way to get into exhentai, because it probably changed many times.

But as much as I know you had to register on the forums not on ehentai main site and kinda make some regular visits there regularly.
being registered on the main site will not give you any access anywhere.
technically it was required that in some way you set proper cookies, so using plugin was one of the ways to do that