The Amazin Kindle Fire has proven itself to be a very popular and capable device. There is certainly no shortage of development for the device, much of which is listed in a very helpful thread posted by XDA Senior Member stiffmast3r.
Many people tend to immediately think of custom ROMs and kernels as the be-all and end-all of development that happens on XDA, and the bootloader of our devices is often overlooked. However this is not the case over in the Kindle Fire section. FireFireFire is a custom bootloader originally developed by XDA Senior Member pokey9000, which offers increased functionality over the stock bootloader in 3 ways:
Unfortunately it seems that pokey9000 is no longer working on FireFireFire. However, the modification lives on, and the torch has been passed to Senior Member kinfauns. His version brings a few changes that you may prefer to the original, namely a different boot logo and a shorter fastboot window which will shave 5 seconds off the boot time.
You can find both versions in the links below: