The Hubei Library DouBan Plugin is a free Chrome add-on that displays the index information of books in the Hubei Library on the DouBan book page. With this plugin, users can easily access the availability of a book in the Hubei Library directly from the DouBan book page.

By using the book's ISBN, the plugin queries the Hubei Library's OPAC (Online Public Access Catalog) and provides a preview of the book's "in-library information". In case of any errors, the plugin also suggests searching the results based on the book's title.

The Hubei Library DouBan Plugin is a useful tool for book enthusiasts in Hubei province who want to quickly check the availability of books in their local library while browsing the DouBan book page. With its seamless integration into the Chrome browser, users can conveniently access this information without having to navigate to the library's website separately.