Unity editor window to find referenced game objects of selected script in currently opened scene.

ScriptReferencesFinder.cs

using System.Collections.Generic;
using UnityEditor;
using UnityEngine;

public class ScriptReferencesFinder : EditorWindow
{
    private Vector2 scrollPosition;
    private List<MonoBehaviour> references = new List<MonoBehaviour>();

    private static MonoScript field = null;
    private static ScriptReferencesFinder assetReferenceFinder = null;

    [MenuItem("Script References Finder/Find References", false, 0)]
    private static void FindReferences()
    {
        assetReferenceFinder = GetWindow<ScriptReferencesFinder>();
    }

    private static void Find()
    {
        if (field == null)
        {
            return;
        }

        var components = UnityEngine.Resources.FindObjectsOfTypeAll<MonoBehaviour>();
        if (components == null || components.Length <= 0)
        {
            return;
        }

        var matchedComponents = ArrayUtility.FindAll(components, (reference) =>
        {
            var mObj = reference as Object;