Probably has something to do with Google pulling app. has announced that all users of Fire TV devices will now be able to browser the web
Silk - Web Browser::Appstore for Android
Firefox for Fire TV and Echo Show will be discontinued - gHacks Tech News
Best FireStick Browsers (2024) - How to Install & Set up
Is Silk or Firefox the better browser to use for videos on Fire TV and a Fire Stick? - Quora
Mozilla is shutting down Firefox for Fire TV and Echo Show devices
Fire TV update pulls support four days early
Exclusive: Silk and Firefox browsers are coming to the Echo Show
adds Firefox browser to Fire TV and it supports
Mozilla Firefox ends support for Fire TV, Echo Show, CIO News, ET CIO
Best FireStick Browsers (2024) - How to Install & Set up
First Look: The New Fire TV Silk Web Browser