I am porting android apps to Kindle Fire in eclipse. the problem is that i did not know how to on/off the USB debugging mode of Kindle Fire??
You simply need to add the Fire's device ID to your android_usb.ini
file so that the Google ADB drivers will find it. You can do this from the command line very easily with:
echo 0x1949 >> "%USERPROFILE%\.android\adb_usb.ini
Then restart adb
adb kill-server
adb start-server