[Q] removing stock apps correctly (busybox and terminal emulator) topic

Alright, so checking up the system folder with root explorer I noticed that there are several applications related to the stock music player.
I can't just simply remove these "apks", right? Pretty certain there'd be leftovers of this app somewhere.
So, I realize, there's no "uninstall" script for the music app, but I was wondering, what is the most correct way to delete music application?
Simple doing this won't cut it, right?

Code:

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su
cd system/app
mount -o rw,remount /system
rm -r MusicCommonUtility
rm -rMusicLiveShare2.apk
rm -rMusicPlayerWT.apk
mount -o remount,ro /system

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[Q] Kindle Fire; used Kindle Fire Utility v0.9.9, Browser & Terminal don't have root. topic

I've got a kindle fire that I rooted and installed android using the Kindle Fire Utility v0.9.9 (http://forum.xda-developers.com/show....php?t=1399889), and SuperSU is supposedly running correctly, but when I run root browser (by JRummy Apps Inc.), it cannot look into the /data/ folder, and trying to "su" on a terminal emulator gives an error. Any suggestions as to what might have gone wrong and/or how to fix it?

Thank you
Meriru