Map place ids to their index inside the places array to make finding a place already in the array faster. Also rename `places` to `displayedPlaces` to ensure easier reading of the code (too many places arrays!)
Map place ids to their index inside the places array to make finding a place already in the array faster. Also rename `places` to `displayedPlaces` to ensure easier reading of the code (too many places arrays!)

mozilla-mobile/prox,mozilla-mobile/prox,mozilla-mobile/prox,mozilla-mobile/prox