Firefox Mozilla account lets you send tabs from another device to your Fire TV, as well as use Mozilla services like Sync, Firefox Lockwise and many more on your other devices.

1. 1. Click Send Firefox tabs to Fire TV from the toolbar on the Firefox home screen on your Fire TV.
2. 2. Click Sign-in.
3. 3. Enter your login information.
4. 4. Check your email to confirm your sign-in (you can use another device, not just your Fire TV).
5. 5. Your Mozilla account avatar will appear in your toolbar once you’ve signed in.