File-fire will error out when it doesnt have a firebase-app element in the same html file as file-fire.
Didnt work: Had a global firebase-app in my-app.html (main app element), file-fire was a child of a child of my-app.html
Worked: Created a second firebase-app in the same html as file-fire, this firebase-app had the name property set while the global one didnt. The file-fire used app-name to access the second firebase-app