The code below shows how I show the Google map to get current position using js. But now I want it to fetch the lat and long from firebase collection to show someone's else location. Can someone help me guide through please?

x = navigator.geolocation;        
x.getCurrentPosition(success,failure);
        
function success (position) {
    var myLat = position.coords.latitude;
    var myLong = position.coords.longitude;
        
    var coords = new google.maps.LatLng(myLat,myLong);
        
    var mapOptions = {
        zoom: 14,
        center: coords,
        mapTypeID: google.maps.MapTypeId.RoadMap
    }
        
    var map = new google.maps.Map(document.getElementById("map"), mapOptions);
    var marker = new google.maps.Marker({map:map, position:coords});
}
        
function failure(){}