diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.cpp b/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.cpp
index 622be8098f..b92f3720fa 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.cpp
@@ -7,15 +7,20 @@
 
 #include <LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h>
 #include <LibWeb/HTML/WorkerGlobalScope.h>
+#include <LibWeb/HighResolutionTime/TimeOrigin.h>
+#include <WebWorker/DedicatedWorkerHost.h>
 
 namespace Web::HTML {
 
 JS_DEFINE_ALLOCATOR(WorkerEnvironmentSettingsObject);
 
 // https://html.spec.whatwg.org/multipage/workers.html#set-up-a-worker-environment-settings-object
-JS::NonnullGCPtr<WorkerEnvironmentSettingsObject> WorkerEnvironmentSettingsObject::setup(JS::NonnullGCPtr<Page> page, NonnullOwnPtr<JS::ExecutionContext> execution_context /* FIXME: null or an environment reservedEnvironment, a URL topLevelCreationURL, and an origin topLevelOrigin */)
+JS::NonnullGCPtr<WorkerEnvironmentSettingsObject> WorkerEnvironmentSettingsObject::setup(JS::NonnullGCPtr<Page> page, NonnullOwnPtr<JS::ExecutionContext> execution_context, SerializedEnvironmentSettingsObject const& outside_settings, HighResolutionTime::DOMHighResTimeStamp unsafe_worker_creation_time)
 {
-    // 1. FIXME: Let inherited origin be outside settings's origin.
+    (void)unsafe_worker_creation_time;
+
+    // 1. Let inherited origin be outside settings's origin.
+    auto inherited_origin = outside_settings.origin;
 
     // 2. Let realm be the value of execution context's Realm component.
     auto realm = execution_context->realm;
@@ -28,9 +33,13 @@ JS::NonnullGCPtr<WorkerEnvironmentSettingsObject> WorkerEnvironmentSettingsObjec
     // NOTE: See the functions defined for this class.
     auto settings_object = realm->heap().allocate<WorkerEnvironmentSettingsObject>(*realm, move(execution_context), worker);
     settings_object->target_browsing_context = nullptr;
+    settings_object->m_origin = move(inherited_origin);
 
     // FIXME: 5. Set settings object's id to a new unique opaque string, creation URL to worker global scope's url, top-level creation URL to null, target browsing context to null, and active service worker to null.
-    // FIXME: 6. If worker global scope is a DedicatedWorkerGlobalScope object, then set settings object's top-level origin to outside settings's top-level origin.
+    // 6. If worker global scope is a DedicatedWorkerGlobalScope object, then set settings object's top-level origin to outside settings's top-level origin.
+    if (is<WebWorker::DedicatedWorkerHost>(worker)) {
+        settings_object->top_level_origin = outside_settings.top_level_origin;
+    }
     // FIXME: 7. Otherwise, set settings object's top-level origin to an implementation-defined value.
 
     // 8. Set realm's [[HostDefined]] field to settings object.
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h b/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h
index b01af2f73d..169fcf8f62 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h
@@ -24,7 +24,7 @@ public:
     {
     }
 
-    static JS::NonnullGCPtr<WorkerEnvironmentSettingsObject> setup(JS::NonnullGCPtr<Page> page, NonnullOwnPtr<JS::ExecutionContext> execution_context /* FIXME: null or an environment reservedEnvironment, a URL topLevelCreationURL, and an origin topLevelOrigin */);
+    static JS::NonnullGCPtr<WorkerEnvironmentSettingsObject> setup(JS::NonnullGCPtr<Page> page, NonnullOwnPtr<JS::ExecutionContext> execution_context, SerializedEnvironmentSettingsObject const& outside_settings, HighResolutionTime::DOMHighResTimeStamp unsafe_worker_creation_time);
 
     virtual ~WorkerEnvironmentSettingsObject() override = default;
 
diff --git a/Userland/Services/WebWorker/DedicatedWorkerHost.cpp b/Userland/Services/WebWorker/DedicatedWorkerHost.cpp
index c5ce1219c9..3c150c62bc 100644
--- a/Userland/Services/WebWorker/DedicatedWorkerHost.cpp
+++ b/Userland/Services/WebWorker/DedicatedWorkerHost.cpp
@@ -14,6 +14,7 @@
 #include <LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h>
 #include <LibWeb/HTML/WorkerDebugConsoleClient.h>
 #include <LibWeb/HTML/WorkerGlobalScope.h>
+#include <LibWeb/HighResolutionTime/TimeOrigin.h>
 #include <LibWeb/Loader/ResourceLoader.h>
 #include <WebWorker/DedicatedWorkerHost.h>
 
@@ -33,6 +34,9 @@ void DedicatedWorkerHost::run(JS::NonnullGCPtr<Web::Page> page, Web::HTML::Trans
 {
     bool const is_shared = false;
 
+    // 3. Let unsafeWorkerCreationTime be the unsafe shared current time.
+    auto unsafe_worker_creation_time = Web::HighResolutionTime::unsafe_shared_current_time();
+
     // 7. Let realm execution context be the result of creating a new JavaScript realm given agent and the following customizations:
     auto realm_execution_context = Web::Bindings::create_a_new_javascript_realm(
         Web::Bindings::main_thread_vm(),
@@ -52,7 +56,7 @@ void DedicatedWorkerHost::run(JS::NonnullGCPtr<Web::Page> page, Web::HTML::Trans
 
     // 9. Set up a worker environment settings object with realm execution context,
     //    outside settings, and unsafeWorkerCreationTime, and let inside settings be the result.
-    auto inner_settings = Web::HTML::WorkerEnvironmentSettingsObject::setup(page, move(realm_execution_context));
+    auto inner_settings = Web::HTML::WorkerEnvironmentSettingsObject::setup(page, move(realm_execution_context), outside_settings_snapshot, unsafe_worker_creation_time);
 
     auto& console_object = *inner_settings->realm().intrinsics().console_object();
     m_console = console_object.heap().allocate_without_realm<Web::HTML::WorkerDebugConsoleClient>(console_object.console());