For those that are new Amazon Fire TV owners, this short video shows you how to enable third party apps/apks to install on your Fire TV device. This is for latest software as of the recording of this video.
Fire TV Stick 4K - https://amzn.to/2Erl2Db
Fire TV Cube (hands free) - https://amzn.to/2E5skuX
▶️ DTube
▶️ IPFS