北大蔵書検索 is a Chrome extension designed to enhance the book browsing experience on Amazon by checking the availability of books in the Hokkaido University library. When a user views a book on Amazon, the extension automatically detects the ISBN and performs a search in the library's database, displaying results alongside the book page. This provides users with immediate access to information about the book's location, call number, and borrowing status without needing to navigate away from Amazon.

The extension offers numerous benefits, such as time savings by eliminating the need to manually search for books in a separate window. It facilitates efficient research and study by quickly identifying available library resources, thereby optimizing literature collection efforts. Users can make informed purchasing decisions by checking the availability of books before buying, as it also provides details on lending status and potential reservation options.