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To retrieve a logged-in user's Firebase metadata in React, you can use the Firebase Auth SDK's currentUser property to access the current user's metadata.

Here's an example code snippet that demonstrates how to retrieve the user's metadata:

import firebase from 'firebase/app';
import 'firebase/auth';

// Get the current user
const user = firebase.auth().currentUser;

// Get the metadata for the current user
const metadata = user.metadata;

// Access the metadata properties
console.log(metadata.creationTime);
console.log(metadata.lastSignInTime);

In this code, firebase.auth().currentUser is used to fetch the current user, and the metadata property is then accessed to retrieve the metadata for that user.

The metadata object contains various properties, such as creationTime, lastSignInTime, and signInProvider, which you can use to provide additional functionality or display information to the user.