What does "Firestore permission denied without authentication" mean?

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"Firestore permission denied without authentication" means that the user is trying to access the Cloud Firestore database without being authenticated. Cloud Firestore requires users to be authenticated with valid credentials in order to perform any database operations, such as reading or writing data. If a user tries to access the database without being properly authenticated, they will receive a "permission denied" error message. This is a security measure to protect the database from unauthorized access.