Third-party software is not supported by default on the Nook. To install Firefox on your Barnes & Noble Nook Color, you will need to unlock ("root") your device and install some unofficial software on it. This is '''not''' supported by Barnes & Noble, and you do this at your own risk. For example of how to root your device, see: http://forum.xda-developers.com/showthread.php?t=872490 Future versions of the official Nook software might have built-in support for third-party software. If this happens, we'll work with Barnes & Noble to make Firefox available to Nook users.