LibriFox is a native Firefox OS audio book player powered by LibriVox.org.
Search for books by title and author last name, download chapters individually or all at once. You can also choose between internal and external storage for downloads.
Ability to manage and listen to downloaded chapters. Once a chapter finishes, the player will go to the next downloaded chapter if it exists.
You can also add your own files via the Firefox OS filesystem. However, you must change the file extension to .lfa for the player to recognize them.
In order to run this app, add the librifox/ directory (one level down from root) as a packaged web app in the Firefox OS WebIDE