I use the Collections for Kindle Fire (
http://www.amazon.com/Collections-Ki...or+kindle+fire). It will open sideloaded and Amazon loaded books. One downside, it will open all books on the Fire not just those enabled in FreeTime. I like this because I can turn off the Books/Audiobooks feature and still show others the features of the Fire without them having access to all my content in Books and Audiobooks.