Just a bit of info for any one thinking of rooting the Kindle fire. If you plan on streaming videos with Amazon Prime don't root it just yet.
I rooted mine and I wasn't able to stream I called Amazon Support thinking it was a problem with my account and they said the error message I was getting was do to rooting, of course I played dumb. I unrooted the device and video streaming is working again.
The error message was something like...."Your device is no longer configure correctly for video playback" or something along those lines.
Just a bit of info