Mozilla Developer Preview, Portable Edition 3.7 Alpha 5 has been released. Mozilla Developer Preview is an early developer milestone of the popular Firefox web browser bundled with a PortableApps.com Launcher as a portable app that is being built on top of Mozilla's Gecko 1.9.3 layout engine, Mozilla Developer Preview Alpha is being made available for testing purposes only, and is intended for web application developers and our testing community. (For everyday use, please use Mozilla Firefox, Portable Edition.) The nightly build of Minefield 3.7 Alpha 6 Pre has also been made available. Both are packaged in PortableApps.com Format so they can easily integrate with the PortableApps.com Suite. And they're open source and completely free.