Hi. I made a Firefox extension to download e-books directly from Goodreads. I hope you like it. I send it to Mozilla addons. I am waiting for approval. Since it may take to 4 weeks, so I uploaded it to my website. You can use [this](https://karasu.xyz/bunken) link to install the extension until Mozilla approves and adds it to the store.
If you like it please give it a star on [Github](https://github.com/talhabw/bunken).