Fire HD - turn off personalized recommendations
This is on the Kindle support forum:
We wanted to let you know that in the coming weeks, free software updates will be coming to Kindle Fire HD and the latest generation Kindle Fire. These software updates will include Kindle FreeTime, a tablet experience just for kids allowing parents to set daily screen time limits, and give access to appropriate content for each child. We're also adding a setting to let customers control whether or not personalized recommendations appear below the carousel on the device homepage. In addition, customers will be able to set their device default language to one of six languages, including English (US), English (UK), German, French, Italian, and Spanish. These updates will be delivered automatically to your Kindle Fire.
The Kindle Team
So it looks like we'll be able to turn off that ribbon on the bottom of "customers also bought".