I Have Ngcordova Local Notification Working, How Can I Make It Trigger For Every User

I have an ionicPopup with textarea where when user enters text, saves in firebase. On this change of value im able to trigger ngCordova local notification on mobile who's user has

Solution 1:

OK its working using,

firebaseRef.on('value', function(){
    local notification scheduling
});

with 2 problems though.

1. Triggering notification on message senders side as well.
2. Notification fails when app's state is 'background'.