listener sends response everytime when the same listener is attached in a new tab

I have added a listener to get a list of records but this listener sends response everytime when the same listener is attached in a new tab.

Is there any way to stop it?

I used stateChanges() to retrieve records

Start by reproducing the behavior with stateChanges() by attaching the same listener in two tabs and observing the repeated responses. Trace the AngularFire/Firebase listener path involved; done means the listener still returns the records without sending unwanted repeated responses.

Written by the indexing model from the issue text.