Question: what app to download to watch movies on firestick?
Answer: ShowBox. Showbox is by far the most popular online streaming app thanks to its smooth UI and easy navigation. ... 
Tubi TV. This free app is available in Google Play Store. ... 
Vudu. ... 
Kodi. ... 
CotoMovies. ... 
Popcorn Time. ... 
Sony Crackle. ... 
Freeflix HQ.