Libby (Legacy) Audiobook Exporter is a browser extension available on Chrome that allows users to save Libby audiobooks to their local drive. This extension is the non-supported legacy version of the "Libby Audiobook Exporter" extension. It is designed for users who are unable to use the extension popup due to compatibility issues, particularly on mobile browsers.

Unlike the newer version, this legacy version uses a content script that adds controls to the top of the Libby player page. It provides a convenient way for users to export audiobooks directly to their local storage. However, it is important to note that this version is not actively supported by the developer and is recommended only for users who cannot use the newer version.

If your browser supports the newer version, it is advisable to use that instead. The non-legacy version of the Libby Audiobook Exporter extension can be found on the Chrome Web Store under the name "Libby Audiobook Exporter." It offers a more updated and supported experience for saving Libby audiobooks.