[Fire HD 8 and HD 10 General] zmg:
Works on HD 7 version 5.6.2.0...

I've read posts claiming it does and doesn't work on the HD 7 running version 5.6.2.0 and I think I know the reason why...

The issue is the directions need to be slightly different for the 7. After installing the com.amazon.unifiedsharefacebook.apk DO NOT REBOOT. You're welcome.

Here's the exact steps I took in the form of a batch file for anyone interested:

echo assumes you have adb installed and com.amazon.unifiedsharefacebook in the same directory
adb push com.amazon.unifiedsharefacebook.apk storage/sdcard0
echo assumes devices plugged in and adb enabled...
adb shell pm install -r -d /sdcard/com.amazon.unifiedsharefacebook.apk
echo.-------------------------------------------------------------------------------
echo Disabling amazon apps...
echo.-------------------------------------------------------------------------------
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.venezia
echo com.amazon.avod = Prime Video run unhide command if you want it back
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.avod
echo com.amazon.kindle = Books/Newsstand Kindle apps run unhide command if you want them
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.kindle
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.mp3
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.kindle.kso
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.weather
echo com.amazon.photos = Prime Photos run unhide command if you want it back
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.photos
adb shell run-as com.amazon.unifiedsharefacebook pm hide org.mopria.printplugin
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.photos.importer
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.settings.systemupdates
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.unifiedsharetwitter
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.kingsoft.office.amz
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.goodreads.kindle
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.audible.application.kindle
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.tablet.subscriptions
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.tahoe
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.ags.app
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.webapp
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.cloud9
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.cloud9.kids
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.unifiedsharesinaweibo
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.dee.app
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.kindle.unifiedSearch
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.unifiedsharegoodreads
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.zico
adb shell run-as com.amazon.unifiedsharefacebook pm hide amazon.alexa.tablet
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.socialplatform
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.geo.client.maps
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.ods.kindleconnect
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.readynowcore
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazon.geo.mapsv2.services
adb shell run-as com.amazon.unifiedsharefacebook pm hide jp.co.omronsoft.iwnnimme.mlaz
adb shell run-as com.amazon.unifiedsharefacebook pm hide com.amazonkcp.tutorial
echo COMPLETED!
pause

Thanks to everyone who helped make this device more bearable!