Dagger 2 Inject problem: `Firebase` never get's injected into `FirebaseService.java`

ApplicationComponent.java

@Singleton
@Component(modules = ApplicationModule.class)
public interface ApplicationComponent {

    @ApplicationContext Context context();
    Application application();
    Firebase firebase();
}

ApplicationModule.java

@Module
public class ApplicationModule {

    protected final Application mApplication;

    public ApplicationModule(Application application) {
        mApplication = application;
    }

    @Provides
    Application provideApplication() {
        return mApplication;
    }

    @Provides
    @ApplicationContext
    Context provideContext() {
        return mApplication;
    }

    @Provides
    @Singleton
    Firebase provideFirebase(@ApplicationContext Context context) {
        Firebase.setAndroidContext(context);
        return new Firebase(Util.FIREBASE_URL);
    }
}

FirebaseService.java

public class FirebaseService {

    @Inject Firebase mFirebaseRef; //NEVER GET'S INJECTED!

    @Override
    public LoginResult signinWithEmail(final String email, final String password) {
      mFirebaseRef.dostuff(); //THIS REFERENCE DOESN'T GET INJECTED!
    }
}

MyActivity.java

public class MyActivity extends AppCompatActivity {

    private ActivityComponent mActivityComponent;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    public ActivityComponent getActivityComponent() {
        if (mActivityComponent == null) {
            mActivityComponent = DaggerActivityComponent.builder()
                    .activityModule(new ActivityModule(this))
                    .applicationComponent(MyApplication.get(this).getComponent())
                    .build();
        }
        return mActivityComponent;
    }
}

MyApplication.java

public class MyApplication extends Application {

    ApplicationComponent mApplicationComponent;

    @Override
    public void onCreate() {
        super.onCreate();
    }

    public static MyApplication get(Context context) {
        return (MyApplication) context.getApplicationContext();
    }

    public ApplicationComponent getComponent() {
        if (mApplicationComponent == null) {
            mApplicationComponent = DaggerApplicationComponent.builder()
                    .applicationModule(new ApplicationModule(this))
                    .build();
        }
        return mApplicationComponent;
    }

    public void setComponent(ApplicationComponent applicationComponent) {
        mApplicationComponent = applicationComponent;
    }
}