<button type="button" class="btn btn-info" ng-click="openModal('md')">E-mail & password</button>

$scope.openModal = function(size) {
    var modalInstance = $uibModal.open({
      templateUrl: 'javascript/templates/emailLoginModalContent.html',
      controller: 'EmailLoginModalInstanceCtrl',
      scope: $scope,
      size: size
    });
  };

app.controller('EmailLoginModalInstanceCtrl', ['$scope', '$uibModalInstance', '$firebaseAuth', function($scope, $uibModalInstance, $firebaseAuth) {
    console.log("EmailLoginModalInstanceCtrl controller.");

    var ref = new Firebase("https://my-firebase.firebaseio.com/");
    $scope.authObj = $firebaseAuth(ref);

    // Login user

    $scope.loginUser = function(user) {
      ref.authWithPassword({
        email: $scope.user.email,
        password: $scope.user.password
      }, function(error, authData) {
        if (error) {
          console.log("Login Failed!", error);
        } else {
          console.log("Authenticated successfully with payload:", authData);
          $scope.authData = authData;
          $scope.authData.uid = authData.uid;
          console.log($scope.authData.uid);
          $scope.reset();
          $scope.cancel();
          $scope.$apply(function() {
            console.log("Applied!");
          });
        }
      });
    };

  }]);