diff --git a/Libraries/LibWeb/HTML/WorkerAgentParent.cpp b/Libraries/LibWeb/HTML/WorkerAgentParent.cpp
index 71822d7ce17..3e0b9515b2b 100644
--- a/Libraries/LibWeb/HTML/WorkerAgentParent.cpp
+++ b/Libraries/LibWeb/HTML/WorkerAgentParent.cpp
@@ -34,7 +34,7 @@ void WorkerAgentParent::initialize(JS::Realm& realm)
 
     // NOTE: This blocking IPC call may launch another process.
     //    If spinning the event loop for this can cause other javascript to execute, we're in trouble.
-    auto worker_socket_file = Bindings::principal_host_defined_page(realm).client().request_worker_agent();
+    auto worker_socket_file = Bindings::principal_host_defined_page(realm).client().request_worker_agent(Bindings::AgentType::DedicatedWorker);
 
     auto worker_socket = MUST(Core::LocalSocket::adopt_fd(worker_socket_file.take_fd()));
     MUST(worker_socket->set_blocking(true));
diff --git a/Libraries/LibWeb/Page/Page.h b/Libraries/LibWeb/Page/Page.h
index 68ba9f5f318..f9da700cb87 100644
--- a/Libraries/LibWeb/Page/Page.h
+++ b/Libraries/LibWeb/Page/Page.h
@@ -2,7 +2,7 @@
  * Copyright (c) 2020-2023, Andreas Kling <andreas@ladybird.org>
  * Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
  * Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
- * Copyright (c) 2023, Shannon Booth <shannon@serenityos.org>
+ * Copyright (c) 2023-2025, Shannon Booth <shannon@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -20,6 +20,7 @@
 #include <LibGfx/Size.h>
 #include <LibIPC/Forward.h>
 #include <LibURL/URL.h>
+#include <LibWeb/Bindings/MainThreadVM.h>
 #include <LibWeb/CSS/PreferredColorScheme.h>
 #include <LibWeb/CSS/PreferredContrast.h>
 #include <LibWeb/CSS/PreferredMotion.h>
@@ -396,7 +397,7 @@ public:
 
     virtual void page_did_change_audio_play_state(HTML::AudioPlayState) { }
 
-    virtual IPC::File request_worker_agent() { return IPC::File {}; }
+    virtual IPC::File request_worker_agent([[maybe_unused]] Web::Bindings::AgentType worker_type) { return IPC::File {}; }
 
     virtual void page_did_mutate_dom([[maybe_unused]] FlyString const& type, [[maybe_unused]] DOM::Node const& target, [[maybe_unused]] DOM::NodeList& added_nodes, [[maybe_unused]] DOM::NodeList& removed_nodes, [[maybe_unused]] GC::Ptr<DOM::Node> previous_sibling, [[maybe_unused]] GC::Ptr<DOM::Node> next_sibling, [[maybe_unused]] Optional<String> const& attribute_name) { }
 
diff --git a/Libraries/LibWebView/HelperProcess.cpp b/Libraries/LibWebView/HelperProcess.cpp
index c3af333b38b..98ff959dc92 100644
--- a/Libraries/LibWebView/HelperProcess.cpp
+++ b/Libraries/LibWebView/HelperProcess.cpp
@@ -167,7 +167,7 @@ ErrorOr<NonnullRefPtr<ImageDecoderClient::Client>> launch_image_decoder_process(
     return launch_server_process<ImageDecoderClient::Client>("ImageDecoder"sv, arguments);
 }
 
-ErrorOr<NonnullRefPtr<Web::HTML::WebWorkerClient>> launch_web_worker_process()
+ErrorOr<NonnullRefPtr<Web::HTML::WebWorkerClient>> launch_web_worker_process(Web::Bindings::AgentType type)
 {
     Vector<ByteString> arguments;
 
@@ -179,6 +179,21 @@ ErrorOr<NonnullRefPtr<Web::HTML::WebWorkerClient>> launch_web_worker_process()
     arguments.append("--image-decoder-socket"sv);
     arguments.append(ByteString::number(image_decoder_socket.fd()));
 
+    arguments.append("--type"sv);
+    switch (type) {
+    case Web::Bindings::AgentType::DedicatedWorker:
+        arguments.append("dedicated"sv);
+        break;
+    case Web::Bindings::AgentType::SharedWorker:
+        arguments.append("shared"sv);
+        break;
+    case Web::Bindings::AgentType::ServiceWorker:
+        arguments.append("service"sv);
+        break;
+    default:
+        VERIFY_NOT_REACHED();
+    }
+
     return launch_server_process<Web::HTML::WebWorkerClient>("WebWorker"sv, move(arguments));
 }
 
diff --git a/Libraries/LibWebView/HelperProcess.h b/Libraries/LibWebView/HelperProcess.h
index b36211f647d..fb258851514 100644
--- a/Libraries/LibWebView/HelperProcess.h
+++ b/Libraries/LibWebView/HelperProcess.h
@@ -10,6 +10,7 @@
 #include <AK/Optional.h>
 #include <LibImageDecoderClient/Client.h>
 #include <LibRequests/RequestClient.h>
+#include <LibWeb/Bindings/MainThreadVM.h>
 #include <LibWeb/Worker/WebWorkerClient.h>
 #include <LibWebView/ViewImplementation.h>
 #include <LibWebView/WebContentClient.h>
@@ -26,7 +27,7 @@ ErrorOr<NonnullRefPtr<WebView::WebContentClient>> launch_spare_web_content_proce
     Optional<IPC::File> request_server_socket = {});
 
 ErrorOr<NonnullRefPtr<ImageDecoderClient::Client>> launch_image_decoder_process();
-ErrorOr<NonnullRefPtr<Web::HTML::WebWorkerClient>> launch_web_worker_process();
+ErrorOr<NonnullRefPtr<Web::HTML::WebWorkerClient>> launch_web_worker_process(Web::Bindings::AgentType);
 ErrorOr<NonnullRefPtr<Requests::RequestClient>> launch_request_server_process();
 
 ErrorOr<IPC::File> connect_new_request_server_client();
diff --git a/Libraries/LibWebView/WebContentClient.cpp b/Libraries/LibWebView/WebContentClient.cpp
index ebffe484135..0147996af37 100644
--- a/Libraries/LibWebView/WebContentClient.cpp
+++ b/Libraries/LibWebView/WebContentClient.cpp
@@ -659,10 +659,10 @@ void WebContentClient::did_allocate_backing_stores(u64 page_id, i32 front_bitmap
         view->did_allocate_backing_stores({}, front_bitmap_id, front_bitmap, back_bitmap_id, back_bitmap);
 }
 
-Messages::WebContentClient::RequestWorkerAgentResponse WebContentClient::request_worker_agent(u64 page_id)
+Messages::WebContentClient::RequestWorkerAgentResponse WebContentClient::request_worker_agent(u64 page_id, Web::Bindings::AgentType worker_type)
 {
     if (auto view = view_for_page_id(page_id); view.has_value()) {
-        auto worker_client = MUST(WebView::launch_web_worker_process());
+        auto worker_client = MUST(WebView::launch_web_worker_process(worker_type));
         return worker_client->clone_transport();
     }
 
diff --git a/Libraries/LibWebView/WebContentClient.h b/Libraries/LibWebView/WebContentClient.h
index a181b4e88e7..9c8feb017e4 100644
--- a/Libraries/LibWebView/WebContentClient.h
+++ b/Libraries/LibWebView/WebContentClient.h
@@ -10,6 +10,7 @@
 #include <AK/SourceLocation.h>
 #include <LibIPC/ConnectionToServer.h>
 #include <LibIPC/Transport.h>
+#include <LibWeb/Bindings/MainThreadVM.h>
 #include <LibWeb/CSS/StyleSheetIdentifier.h>
 #include <LibWeb/HTML/ActivateTab.h>
 #include <LibWeb/HTML/FileFilter.h>
@@ -129,7 +130,7 @@ private:
     virtual void did_change_audio_play_state(u64 page_id, Web::HTML::AudioPlayState) override;
     virtual void did_update_navigation_buttons_state(u64 page_id, bool back_enabled, bool forward_enabled) override;
     virtual void did_allocate_backing_stores(u64 page_id, i32 front_bitmap_id, Gfx::ShareableBitmap, i32 back_bitmap_id, Gfx::ShareableBitmap) override;
-    virtual Messages::WebContentClient::RequestWorkerAgentResponse request_worker_agent(u64 page_id) override;
+    virtual Messages::WebContentClient::RequestWorkerAgentResponse request_worker_agent(u64 page_id, Web::Bindings::AgentType worker_type) override;
 
     Optional<ViewImplementation&> view_for_page_id(u64, SourceLocation = SourceLocation::current());
 
diff --git a/Services/WebContent/PageClient.cpp b/Services/WebContent/PageClient.cpp
index 86c36aad0bb..3fb349aca11 100644
--- a/Services/WebContent/PageClient.cpp
+++ b/Services/WebContent/PageClient.cpp
@@ -664,9 +664,9 @@ void PageClient::page_did_allocate_backing_stores(i32 front_bitmap_id, Gfx::Shar
     client().async_did_allocate_backing_stores(m_id, front_bitmap_id, front_bitmap, back_bitmap_id, back_bitmap);
 }
 
-IPC::File PageClient::request_worker_agent()
+IPC::File PageClient::request_worker_agent(Web::Bindings::AgentType type)
 {
-    auto response = client().send_sync_but_allow_failure<Messages::WebContentClient::RequestWorkerAgent>(m_id);
+    auto response = client().send_sync_but_allow_failure<Messages::WebContentClient::RequestWorkerAgent>(m_id, type);
     if (!response) {
         dbgln("WebContent client disconnected during RequestWorkerAgent. Exiting peacefully.");
         exit(0);
diff --git a/Services/WebContent/PageClient.h b/Services/WebContent/PageClient.h
index e89450dfb87..6eb3fb6e615 100644
--- a/Services/WebContent/PageClient.h
+++ b/Services/WebContent/PageClient.h
@@ -172,7 +172,7 @@ private:
     virtual void page_did_insert_clipboard_entry(StringView data, StringView presentation_style, StringView mime_type) override;
     virtual void page_did_change_audio_play_state(Web::HTML::AudioPlayState) override;
     virtual void page_did_allocate_backing_stores(i32 front_bitmap_id, Gfx::ShareableBitmap front_bitmap, i32 back_bitmap_id, Gfx::ShareableBitmap back_bitmap) override;
-    virtual IPC::File request_worker_agent() override;
+    virtual IPC::File request_worker_agent(Web::Bindings::AgentType) override;
     virtual void page_did_mutate_dom(FlyString const& type, Web::DOM::Node const& target, Web::DOM::NodeList& added_nodes, Web::DOM::NodeList& removed_nodes, GC::Ptr<Web::DOM::Node> previous_sibling, GC::Ptr<Web::DOM::Node> next_sibling, Optional<String> const& attribute_name) override;
     virtual void received_message_from_web_ui(String const& name, JS::Value data) override;
 
diff --git a/Services/WebContent/WebContentClient.ipc b/Services/WebContent/WebContentClient.ipc
index bf563c56791..ea8a2558c11 100644
--- a/Services/WebContent/WebContentClient.ipc
+++ b/Services/WebContent/WebContentClient.ipc
@@ -21,6 +21,7 @@
 #include <LibWebView/Mutation.h>
 #include <LibWebView/PageInfo.h>
 #include <LibWebView/ProcessHandle.h>
+#include <LibWeb/Bindings/MainThreadVM.h>
 
 endpoint WebContentClient
 {
@@ -107,5 +108,5 @@ endpoint WebContentClient
 
     did_find_in_page(u64 page_id, size_t current_match_index, Optional<size_t> total_match_count) =|
 
-    request_worker_agent(u64 page_id) => (IPC::File socket) // FIXME: Add required attributes to select a SharedWorker Agent
+    request_worker_agent(u64 page_id, Web::Bindings::AgentType worker_type) => (IPC::File socket) // FIXME: Add required attributes to select a SharedWorker Agent
 }
diff --git a/Services/WebWorker/main.cpp b/Services/WebWorker/main.cpp
index 3f4253bc205..871adb4ff23 100644
--- a/Services/WebWorker/main.cpp
+++ b/Services/WebWorker/main.cpp
@@ -33,6 +33,18 @@
 static ErrorOr<void> initialize_image_decoder(int image_decoder_socket);
 static ErrorOr<void> initialize_resource_loader(GC::Heap&, int request_server_socket);
 
+static ErrorOr<Web::Bindings::AgentType> agent_type_from_string(StringView type)
+{
+    if (type == "dedicated"sv)
+        return Web::Bindings::AgentType::DedicatedWorker;
+    if (type == "shared"sv)
+        return Web::Bindings::AgentType::SharedWorker;
+    if (type == "service"sv)
+        return Web::Bindings::AgentType::ServiceWorker;
+
+    return Error::from_string_literal("Invalid worker type, must be one of: 'dedicated', 'shared', or 'service'");
+}
+
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
     AK::set_rich_debug_enabled(true);
@@ -40,6 +52,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     int request_server_socket { -1 };
     int image_decoder_socket { -1 };
     StringView serenity_resource_root;
+    StringView worker_type_string;
     Vector<ByteString> certificates;
     bool wait_for_debugger = false;
 
@@ -49,11 +62,15 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     args_parser.add_option(serenity_resource_root, "Absolute path to directory for serenity resources", "serenity-resource-root", 'r', "serenity-resource-root");
     args_parser.add_option(certificates, "Path to a certificate file", "certificate", 'C', "certificate");
     args_parser.add_option(wait_for_debugger, "Wait for debugger", "wait-for-debugger");
+    args_parser.add_option(worker_type_string, "Type of WebWorker to start (dedicated, shared, or service)", "type", 't', "type");
+
     args_parser.parse(arguments);
 
     if (wait_for_debugger)
         Core::Process::wait_for_debugger_and_break();
 
+    auto worker_type = TRY(agent_type_from_string(worker_type_string));
+
 #if defined(HAVE_QT)
     QCoreApplication app(arguments.argc, arguments.argv);
     Core::EventLoopManager::install(*new WebView::EventLoopManagerQt);
@@ -68,7 +85,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     Web::Platform::FontPlugin::install(*new WebView::FontPlugin(false));
 
-    Web::Bindings::initialize_main_thread_vm(Web::Bindings::AgentType::DedicatedWorker);
+    Web::Bindings::initialize_main_thread_vm(worker_type);
 
     TRY(initialize_resource_loader(Web::Bindings::main_thread_vm().heap(), request_server_socket));