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Yes, Firebase email/password authentication can be enabled using REST API in C#. Firebase provides REST APIs that can be used to authenticate users using email and password. You can use C# HttpClient to make API calls to Firebase and perform the authentication process.

Here is an example of using Firebase REST API to authenticate users using email and password in C#:

using System;
using System.Net.Http;
using System.Threading.Tasks;

namespace FirebaseAuthentication
{
    class Program
    {
        static readonly HttpClient client = new HttpClient();

        static async Task AuthenticateUser()
        {
            var httpContent = new StringContent("{\"email\":\"[email protected]\",\"password\":\"secret\"}");
            var result = await client.PostAsync("https://identitytoolkit.googleapis.com/v1/accounts:signInWithPassword?key=<your_api_key>", httpContent);
            var response = await result.Content.ReadAsStringAsync();

            Console.WriteLine(response);
        }

        static async Task Main(string[] args)
        {
            await AuthenticateUser();

            Console.ReadKey();
        }
    }
}

In the above code, replace <your_api_key> with your Firebase API key. This code will authenticate the user using the provided email and password and return the response as a string. You can then parse the response to get the authentication token or any other details you need.