diff --git a/Lombiq.JsonEditor.Test.UI/Extensions/TestCaseUITestContextExtensions.cs b/Lombiq.JsonEditor.Test.UI/Extensions/TestCaseUITestContextExtensions.cs
index 3655c33..310353e 100644
--- a/Lombiq.JsonEditor.Test.UI/Extensions/TestCaseUITestContextExtensions.cs
+++ b/Lombiq.JsonEditor.Test.UI/Extensions/TestCaseUITestContextExtensions.cs
@@ -10,7 +10,7 @@ namespace Lombiq.JsonEditor.Tests.UI.Extensions;
 
 public static class TestCaseUITestContextExtensions
 {
-    private const string SampleContentItemId = "4xapn6ykttkk6wbbwgg1aaxqda";
+    private const string SampleContentItemId = "jsonexamplepage00000000000";
     private const string HelloValue = "hello";
     private const string WorldValue = "world";
     private const string TestField = "testField";
diff --git a/Lombiq.JsonEditor/Recipes/JsonEditor.Sample.recipe.json b/Lombiq.JsonEditor/Recipes/JsonEditor.Sample.recipe.json
index 171c3ab..d0fa457 100644
--- a/Lombiq.JsonEditor/Recipes/JsonEditor.Sample.recipe.json
+++ b/Lombiq.JsonEditor/Recipes/JsonEditor.Sample.recipe.json
@@ -96,8 +96,8 @@
       "name": "content",
       "data": [
         {
-          "ContentItemId": "4xapn6ykttkk6wbbwgg1aaxqda",
-          "ContentItemVersionId": "4av5ed2m18bxzzzpxv211g60ng",
+          "ContentItemId": "jsonexamplepage00000000000",
+          "ContentItemVersionId": "[js:uuid()]",
           "ContentType": "JsonExamplePage",
           "DisplayText": null,
           "Latest": true,
@@ -105,7 +105,7 @@
           "ModifiedUtc": "2021-08-23T17:08:18.0374586Z",
           "PublishedUtc": "2021-08-23T17:08:18.0394636Z",
           "CreatedUtc": "2021-08-23T16:14:03.9040848Z",
-          "Owner": "4yhqbehqdk0707whhrj0b5rt51",
+          "Owner": null,
           "Author": "admin",
           "JsonExamplePage": {
             "JsonExampleField": {
diff --git a/Lombiq.JsonEditor/Services/JsonEditorContentSecurityPolicyProvider.cs b/Lombiq.JsonEditor/Services/JsonEditorContentSecurityPolicyProvider.cs
new file mode 100644
index 0000000..e9fe6bd
--- /dev/null
+++ b/Lombiq.JsonEditor/Services/JsonEditorContentSecurityPolicyProvider.cs
@@ -0,0 +1,41 @@
+using Lombiq.HelpfulLibraries.AspNetCore.Security;
+using Lombiq.JsonEditor.Constants;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using static Lombiq.HelpfulLibraries.AspNetCore.Security.ContentSecurityPolicyDirectives;
+using static Lombiq.HelpfulLibraries.AspNetCore.Security.ContentSecurityPolicyDirectives.CommonValues;
+
+namespace Lombiq.JsonEditor.Services;
+
+/// <summary>
+/// Permits <c>blob: data:</c> access to the <see cref="WorkerSrc"/> on pages that include the <see
+/// cref="ResourceNames.Library"/> script.
+/// </summary>
+public class JsonEditorContentSecurityPolicyProvider : ResourceManagerContentSecurityPolicyProvider
+{
+    protected override string ResourceType => "script";
+    protected override string ResourceName => ResourceNames.Library;
+    protected override IReadOnlyCollection<string> DirectiveNameChain { get; } = new[] { WorkerSrc, ScriptSrc };
+    protected override string DirectiveValue => $"{Blob} {Data}";
+
+    protected override ValueTask ThenUpdateAsync(
+        IDictionary<string, string> securityPolicies,
+        HttpContext context,
+        bool resourceExists)
+    {
+        // Fixes "[Severe] blob:https://localhost:9391/6a0aeee0-8ec7-449c-86b4-7668d046d24c 0 Refused to load the
+        // script 'data:application/javascript;base64,...' because it violates the following Content Security Policy
+        // directive" error.
+        if (resourceExists)
+        {
+            securityPolicies[ScriptSrc] = IContentSecurityPolicyProvider
+                .GetDirective(securityPolicies, ScriptSrc)
+                .MergeWordSets(DirectiveValue);
+        }
+
+        return ValueTask.CompletedTask;
+    }
+}
diff --git a/Lombiq.JsonEditor/Startup.cs b/Lombiq.JsonEditor/Startup.cs
index 98ea666..eaad775 100644
--- a/Lombiq.JsonEditor/Startup.cs
+++ b/Lombiq.JsonEditor/Startup.cs
@@ -2,6 +2,7 @@
 using Lombiq.JsonEditor.Constants;
 using Lombiq.JsonEditor.Drivers;
 using Lombiq.JsonEditor.Fields;
+using Lombiq.JsonEditor.Services;
 using Lombiq.JsonEditor.Settings;
 using Lombiq.JsonEditor.TagHelpers;
 using Microsoft.AspNetCore.Builder;
@@ -46,6 +47,7 @@ public override void ConfigureServices(IServiceCollection services)
         services.AddScoped<IContentDisplayDriver, EditJsonActionsMenuContentDisplayDriver>();
         services.AddOrchardServices();
         services.AddScoped<ApiController>();
+        services.AddContentSecurityPolicyProvider<JsonEditorContentSecurityPolicyProvider>();
     }
 
     public override void Configure(IApplicationBuilder app, IEndpointRouteBuilder routes, IServiceProvider serviceProvider) =>