Opening the latest version of Firefox for Fire TV now displays a warning banner at the top informing you that the app will no longer be supported after April 30, 2021. The banner remains present even while browsing web pages. I asked Mozilla about the banner and they told me that it is permanent and that there is no way for users to dismiss it. The only time the banner is not present is when watching a video in full-screen. That means, if you want to continue using Firefox for Fire TV without a warning banner at the top, you’ll need to uninstall the new 4.8 version and sideload the older 4.7.1 version. You can do that by following this guide and entering code