The "Library Book Search Assistant" is a Chrome add-on developed by 无理数. It automatically fetches information on books from specified libraries, facilitating users in locating required library resources effortlessly. When browsing the Douban website, users can conveniently check the library's collection status. The add-on provides details such as the book's location in the library, code, and available quantity, streamlining the process of finding necessary book resources.

To use this add-on, simply click on the plugin icon in the browser to open it. Then, click on the gear icon within the plugin interface. In the settings page, locate and select the library of interest in the province or city. After closing the settings page, the plugin will load the corresponding library information based on your selection.