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Here are the steps to extract data from Firebase's real-time database in C# using the Firesharp library:

1. Install the Firesharp library: You can install the Firesharp library using the NuGet package manager in Visual Studio or by manually downloading and installing the library.

2. Set up Firebase credentials: You need to set up Firebase credentials, including the API key, project ID, and database URL. You can obtain these credentials from the Firebase console.

3. Define the Firesharp client: In your C# code, create a new instance of the Firesharp client and pass in the Firebase credentials.

var firebaseConfig = new FirebaseConfig {
    AuthSecret = "your_auth_secret",
    BasePath = "https://your-project-id.firebaseio.com/"
};

var client = new FirebaseClient(firebaseConfig);

1. Query the database: You can query the Firebase real-time database using the Firesharp client. For example, to get a list of all the items in a certain node, you can use the child method and OnceAsync method:

var response = await client.Child("myNode").OnceAsync<MyObject>();
List<MyObject> myObjects = response.Select(x => x.Object).ToList();

This will return a list of objects of type MyObject that are stored in the myNode node of the Firebase real-time database.

You can also use other Firesharp methods to update, delete, and observe data in the Firebase real-time database.

Note: If you're using Firesharp in a Unity project or in a project that targets .NET Standard 2.0, you'll need to use a different version of the NuGet package.