End of support for Firefox on Amazon Devices - Mozilla
https://support.mozilla.org/en-US/kb/end-support-firefox-amazon-devices
Starting on April 30, 2021, we will no longer support Firefox on Amazon Fire TV or Echo Show. You will no longer be able to install the app on FireTV or receive security updates starting on April 30, 2021. If you have Firefox set as your default browser on Echo Show, you will be redirected to Amazon Silk for web browsing starting April 30, 2021.
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