A login, view, download tool for exhentai & e-hentai
A Greasy Fork user script for exhentai
If that show Login succeeded, and you cannot access exhentai,
First, don't use the private browsing then try again,
if it still doesn't work, it could be that your account doesn't have access to exhentai,
but you still can use other features in e-hentai.
First enable Viewer
Viewer page(s): AllViewer page(s): OneViewer mode
Feedback also works but I won't check every day.