This month, Mozilla has announced plans to phase out support for the Firefox web browser app on the Amazon Fire TV product line. Effective April 30th, 2021, the Mozilla Firefox app on Fire TV will no longer be supported. Amazon’s Silk app will continue to remain available for customers to use. The move comes from Mozilla’s shift in focus given the shift in people’s preferences towards web browsers, a Mozilla spokesperson told BleepingComputer. Amazon Silk app remains available to Fire TV users, as well as its own Silk browser app.
Source: https://www.bleepingcomputer.com/news/security/mozilla-drops-firefox-support-on-amazon-fire-tv/