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ANR stands for "Application Not Responding" in Firebase. It is a situation where an application fails to respond to user input or system events for a period of time. Firebase ANR detection is an integrated feature of the Firebase Performance Monitoring SDK that can help developers identify ANR issues in their app. By detecting ANR issues, developers can take steps to optimize their code and improve the user experience. Firebase ANR detection provides insights into the reasons why the ANR occurred and helps developers diagnose and fix the issue. This can help improve app performance and ensure that users have a seamless experience.