We are being asked to set the OAuth redirect URI for Facebook (as shown below) in the instructions to set up Google Firebase to use Facebook login.
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1- Go to your Firebase Console -> Authentication -> SIGN-IN METHOD -> Facebook. You'll find that link below your App Secret and App ID. Copy it. (It should be something like this: https://your-app-id.firebaseapp.com/__/auth/handler)
2- Go to https://developers.facebook.com/apps/ -> your app -> Product -> Facebook Login (add it if didn't yet) -> Settings. Past the link you've copied into "Valid OAuth redirect URIs" box.