https://techcrunch.com/2018/10/26/you-can-now-use-alexa-to-move-around-inside-apps-like-netflix-and-hulu-on-fire-tv-cube/

Amazon is making it easier to use Alexa to do more than launch apps and streaming services on Fire TV devices, but to also navigate once inside them. The company confirmed it quietly launched an update specifically for Fire TV Cube devices that allows device owners to use Alexa instead of a remote control for doing things like making profile selections, moving up and down or left and right, as well as selecting items.

In other words, Fire TV Cube owners can now use Alexa to navigate their Fire TV, with no remote control required.