How treat data with Firebase and AngularJS - angularjs

Question

I'm trying building an App with AngularJS and Firebase - any one have tried?
I'm following this and using the fist method (implicit sync.) to synchronise my models with Firebase.
In my app I want to have two db/json files (Firebase Url) (kind of stuff) one for users and one for votes.
So I did :
var url = 'mypath.firebaseio.com/votes';
var promise = angularFire(url, $scope, 'votes', []);
promise.then(function() {
$scope.removeVotes = function() {
$scope.votes.splice($scope.toRemove, 1);
$scope.toRemove = null;
};
});
//then I push my votes with a function
$scope.addVote = function() {
$scope.votes.push({
from:user.username,
to:$scope.voteTo,
motivation:$scope.voteMotivation, date:today
});
};
and this works fine I can see my votes in the html rendered with my
<li ng-repeat="vote in votes">
ok
so I did same thing for users:
var url1 = 'mypath.firebaseio.com/users';
var promise1 = angularFire(url1, $scope, 'users', []);
promise1.then(function() {
$scope.users.push({
name: user.username,
pic: user.profile_image_url
});
$scope.removeUser = function() {
$scope.users.splice($scope.toRemove, 1);
$scope.toRemove = null;
};
});
Now I can see my users rendered in my html markup with
<li ng-repeat="user in users">
but that s no trace of my data at https://alex-jpcreative.firebaseio.com/users
Any ideas why?