Amazon Echo Show displays have long been able to stream videos, but the Echo Show 15 is about to get a new trick: the ability to act as a Fire TV device, albeit with some limitations. Announced during Amazon’s annual hardware event Wednesday, the upcoming Fire TV functionality for the wall-mountable Echo Show 15 will allow users to access most–but not all–of the video-streaming services accessible through the Fire TV interface, including channel content from the likes of Paramount+ and Showtime. If you want to watch YouTube or Google’s live-TV streaming service YouTube TV on an Echo Show 15, h…