diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 9429307..84cf6eb 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -4,12 +4,12 @@ jobs:
   build:
     runs-on: windows-2019
     steps:
-    - uses: actions/checkout@v3
-    - uses: microsoft/setup-msbuild@v1.1
-    - uses: NuGet/setup-nuget@v1
+    - uses: actions/checkout@v4
+    - uses: microsoft/setup-msbuild@v2
+    - uses: NuGet/setup-nuget@v2
     - run: nuget restore src/FirefoxAction.sln
     - run: msbuild src/FirefoxAction.sln -t:rebuild -property:Configuration=Release
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         name: dll
         path: ./src/bin/Release/FirefoxAction.CA.dll
\ No newline at end of file
diff --git a/src/FirefoxAction.cs b/src/FirefoxAction.cs
index 109c0f1..b7051ab 100644
--- a/src/FirefoxAction.cs
+++ b/src/FirefoxAction.cs
@@ -23,6 +23,7 @@
 using Microsoft.Deployment.WindowsInstaller;
 using Microsoft.Win32;
 using Newtonsoft.Json.Linq;
+using System;
 
 namespace FirefoxAction
 {
@@ -36,12 +37,11 @@ public static ActionResult ExtensionSettingsInstall(Session session)
             // with error status 1603, but when letting exceptions through the raw exception
             // stack trace will be logged in installer log which gives more information.
 
-            var extensionSettings = GetExtensionSettingsFromSession(session);
+            var extensionSettings = session.GetExtensionSettings();
             session.Log("Begin ExtensionSettingsInstall " + extensionSettings.UUID);
             using (RegistryKey firefox = Utils.FirefoxKey())
             {
-                string value = firefox.GetStringValue("ExtensionSettings", "{}");
-                JObject json = JObject.Parse(value);
+                var json = firefox.GetJSON("ExtensionSettings", "{}");
                 json[extensionSettings.UUID] = new JObject
                 {
                     ["installation_mode"] = "normal_installed",
@@ -54,26 +54,28 @@ public static ActionResult ExtensionSettingsInstall(Session session)
 
         [CustomAction]
         public static ActionResult ExtensionSettingsRemove(Session session)
-        {
-            var extensionSettings = GetExtensionSettingsFromSession(session);
+        {
+            var extensionSettings = session.GetExtensionSettings();
             session.Log("Begin ExtensionSettingsRemove " + extensionSettings.UUID);
             using (RegistryKey firefox = Utils.FirefoxKey())
             {
-                string value = firefox.GetStringValue("ExtensionSettings");
-                if (value != null)
+                var json = firefox.GetJSON("ExtensionSettings");
+                if (json != null)
                 {
-                    JObject json = JObject.Parse(value);
                     json[extensionSettings.UUID] = new JObject
                     {
                         ["installation_mode"] = "blocked"
                     };
                     firefox.SetValue("ExtensionSettings", json.ToString().Split('\n'));
                 }
-                return ActionResult.Success;
             }
+            return ActionResult.Success;
         }
+    }
 
-        private static (string UUID, string URL) GetExtensionSettingsFromSession(Session session)
+    internal static class Utils
+    {
+        internal static (string UUID, string URL) GetExtensionSettings(this Session session)
         {
             // Deferred custom actions cannot directly access installer properties from session,
             // only the CustomActionData property is available, see README how to populate it.
@@ -82,10 +84,7 @@ private static (string UUID, string URL) GetExtensionSettingsFromSession(Session
                 session.CustomActionData["EXTENSIONSETTINGS_URL"]
            );
         }
-    }
 
-    internal static class Utils
-    {
         internal static RegistryKey FirefoxKey()
         {
             using (RegistryKey mozilla = Registry.LocalMachine.OpenOrCreateSubKey(@"Software\Policies\Mozilla", true))
@@ -101,7 +100,7 @@ internal static RegistryKey OpenOrCreateSubKey(this RegistryKey registryKey, str
 
         internal static string GetStringValue(this RegistryKey registryKey, string name, string defaultValue = null)
         {
-            if (!registryKey.ContainsName(name))
+            if (Array.IndexOf(registryKey.GetValueNames(), name) < 0)
                 return defaultValue;
             switch (registryKey.GetValueKind(name))
             {
@@ -114,14 +113,21 @@ internal static string GetStringValue(this RegistryKey registryKey, string name,
             }
         }
 
-        internal static bool ContainsName(this RegistryKey key, string name)
-        {
-            foreach (string value in key.GetValueNames())
-            {
-                if (value == name)
-                    return true;
-            }
-            return false;
+        internal static JObject GetJSON(this RegistryKey registryKey, string name, string defaultValue = null)
+        {
+            string value = registryKey.GetStringValue(name, defaultValue);
+            if (value == null)
+            {
+                return null;
+            }
+            try
+            {
+                return JObject.Parse(value);
+            }
+            catch
+            {
+                return new JObject();
+            }
         }
     }
 }