diff --git a/Userland/Applications/Browser/BrowserWindow.cpp b/Userland/Applications/Browser/BrowserWindow.cpp
index 40518f5fd5f..5f6a1f328f6 100644
--- a/Userland/Applications/Browser/BrowserWindow.cpp
+++ b/Userland/Applications/Browser/BrowserWindow.cpp
@@ -57,9 +57,10 @@ static DeprecatedString search_engines_file_path()
     return builder.to_deprecated_string();
 }
 
-BrowserWindow::BrowserWindow(CookieJar& cookie_jar, URL url)
+BrowserWindow::BrowserWindow(CookieJar& cookie_jar, URL url, WebView::UseJavaScriptBytecode use_javascript_bytecode)
     : m_cookie_jar(cookie_jar)
     , m_window_actions(*this)
+    , m_use_javascript_bytecode(use_javascript_bytecode)
 {
     auto app_icon = GUI::Icon::default_icon("app-browser"sv);
     m_bookmarks_bar = Browser::BookmarksBarWidget::construct(Browser::bookmarks_file_path(), true);
@@ -563,7 +564,7 @@ void BrowserWindow::set_window_title_for_tab(Tab const& tab)
 
 Tab& BrowserWindow::create_new_tab(URL url, Web::HTML::ActivateTab activate)
 {
-    auto& new_tab = m_tab_widget->add_tab<Browser::Tab>("New tab"_short_string, *this);
+    auto& new_tab = m_tab_widget->add_tab<Browser::Tab>("New tab"_short_string, *this, m_use_javascript_bytecode);
 
     m_tab_widget->set_bar_visible(!is_fullscreen() && m_tab_widget->children().size() > 1);
 
diff --git a/Userland/Applications/Browser/BrowserWindow.h b/Userland/Applications/Browser/BrowserWindow.h
index fc6d39cf2e3..5841ae1c106 100644
--- a/Userland/Applications/Browser/BrowserWindow.h
+++ b/Userland/Applications/Browser/BrowserWindow.h
@@ -50,7 +50,7 @@ public:
     void broadcast_window_size(Gfx::IntSize);
 
 private:
-    explicit BrowserWindow(CookieJar&, URL);
+    BrowserWindow(CookieJar&, URL, WebView::UseJavaScriptBytecode);
 
     void build_menus();
     ErrorOr<void> load_search_engines(GUI::Menu& settings_menu);
@@ -86,6 +86,8 @@ private:
     RefPtr<GUI::Action> m_disable_user_agent_spoofing;
     RefPtr<GUI::Action> m_disable_search_engine_action;
     RefPtr<GUI::Action> m_change_homepage_action;
+
+    WebView::UseJavaScriptBytecode m_use_javascript_bytecode {};
 };
 
 }
diff --git a/Userland/Applications/Browser/Tab.cpp b/Userland/Applications/Browser/Tab.cpp
index fced89f5add..04fd85c4c61 100644
--- a/Userland/Applications/Browser/Tab.cpp
+++ b/Userland/Applications/Browser/Tab.cpp
@@ -114,7 +114,7 @@ void Tab::update_status(Optional<String> text_override, i32 count_waiting)
     }
 }
 
-Tab::Tab(BrowserWindow& window)
+Tab::Tab(BrowserWindow& window, WebView::UseJavaScriptBytecode use_javascript_bytecode)
 {
     load_from_gml(tab_gml).release_value_but_fixme_should_propagate_errors();
 
@@ -123,7 +123,7 @@ Tab::Tab(BrowserWindow& window)
 
     auto& webview_container = *find_descendant_of_type_named<GUI::Widget>("webview_container");
 
-    m_web_content_view = webview_container.add<WebView::OutOfProcessWebView>();
+    m_web_content_view = webview_container.add<WebView::OutOfProcessWebView>(use_javascript_bytecode);
 
     auto preferred_color_scheme = Web::CSS::preferred_color_scheme_from_string(Config::read_string("Browser"sv, "Preferences"sv, "ColorScheme"sv, Browser::default_color_scheme));
     m_web_content_view->set_preferred_color_scheme(preferred_color_scheme);
diff --git a/Userland/Applications/Browser/Tab.h b/Userland/Applications/Browser/Tab.h
index 94ec973f8df..67cf4dc6815 100644
--- a/Userland/Applications/Browser/Tab.h
+++ b/Userland/Applications/Browser/Tab.h
@@ -15,6 +15,7 @@
 #include <LibGfx/ShareableBitmap.h>
 #include <LibHTTP/Job.h>
 #include <LibWeb/Forward.h>
+#include <LibWebView/ViewImplementation.h>
 
 namespace WebView {
 class OutOfProcessWebView;
@@ -98,7 +99,7 @@ public:
     WebView::OutOfProcessWebView& view() { return *m_web_content_view; }
 
 private:
-    explicit Tab(BrowserWindow&);
+    Tab(BrowserWindow&, WebView::UseJavaScriptBytecode);
 
     virtual void show_event(GUI::ShowEvent&) override;
     virtual void hide_event(GUI::HideEvent&) override;
diff --git a/Userland/Applications/Browser/main.cpp b/Userland/Applications/Browser/main.cpp
index 22d28c20c4e..f6fe799a2b6 100644
--- a/Userland/Applications/Browser/main.cpp
+++ b/Userland/Applications/Browser/main.cpp
@@ -96,10 +96,12 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Core::System::pledge("stdio recvfd sendfd unix fattr cpath rpath wpath proc exec"));
 
     Vector<DeprecatedString> specified_urls;
+    bool use_ast_interpreter = false;
 
     Core::ArgsParser args_parser;
     args_parser.add_positional_argument(specified_urls, "URLs to open", "url", Core::ArgsParser::Required::No);
     args_parser.add_option(Browser::g_webdriver_content_ipc_path, "Path to WebDriver IPC for WebContent", "webdriver-content-path", 0, "path");
+    args_parser.add_option(use_ast_interpreter, "Enable JavaScript AST interpreter (deprecated)", "ast", 0);
 
     args_parser.parse(arguments);
 
@@ -173,7 +175,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         first_url = TRY(url_from_argument_string(specified_urls.first()));
 
     auto cookie_jar = TRY(Browser::CookieJar::create(*database));
-    auto window = Browser::BrowserWindow::construct(cookie_jar, first_url);
+    auto window = Browser::BrowserWindow::construct(cookie_jar, first_url, use_ast_interpreter ? WebView::UseJavaScriptBytecode::No : WebView::UseJavaScriptBytecode::Yes);
 
     auto content_filters_watcher = TRY(Core::FileWatcher::create());
     content_filters_watcher->on_change = [&](Core::FileWatcherEvent const&) {
diff --git a/Userland/Libraries/LibWebView/OutOfProcessWebView.cpp b/Userland/Libraries/LibWebView/OutOfProcessWebView.cpp
index 7313ae52d6b..523194e0c69 100644
--- a/Userland/Libraries/LibWebView/OutOfProcessWebView.cpp
+++ b/Userland/Libraries/LibWebView/OutOfProcessWebView.cpp
@@ -47,6 +47,8 @@ void OutOfProcessWebView::create_client(EnableCallgrindProfiling)
         });
     };
 
+    client().async_set_use_javascript_bytecode(use_javascript_bytecode() == UseJavaScriptBytecode::Yes);
+
     m_client_state.client_handle = Web::Crypto::generate_random_uuid().release_value_but_fixme_should_propagate_errors();
     client().async_set_window_handle(m_client_state.client_handle);
 
diff --git a/Userland/Services/WebContent/ConnectionFromClient.cpp b/Userland/Services/WebContent/ConnectionFromClient.cpp
index fc2fee1c370..48f290141eb 100644
--- a/Userland/Services/WebContent/ConnectionFromClient.cpp
+++ b/Userland/Services/WebContent/ConnectionFromClient.cpp
@@ -14,6 +14,7 @@
 #include <LibGfx/Bitmap.h>
 #include <LibGfx/Font/FontDatabase.h>
 #include <LibGfx/SystemTheme.h>
+#include <LibJS/Bytecode/Interpreter.h>
 #include <LibJS/Console.h>
 #include <LibJS/Heap/Heap.h>
 #include <LibJS/Runtime/ConsoleObject.h>
@@ -64,6 +65,11 @@ Web::Page const& ConnectionFromClient::page() const
     return m_page_host->page();
 }
 
+void ConnectionFromClient::set_use_javascript_bytecode(bool use_bytecode)
+{
+    JS::Bytecode::Interpreter::set_enabled(use_bytecode);
+}
+
 Messages::WebContentServer::GetWindowHandleResponse ConnectionFromClient::get_window_handle()
 {
     return m_page_host->page().top_level_browsing_context().window_handle();
diff --git a/Userland/Services/WebContent/ConnectionFromClient.h b/Userland/Services/WebContent/ConnectionFromClient.h
index f87bff314fc..1608092c1ad 100644
--- a/Userland/Services/WebContent/ConnectionFromClient.h
+++ b/Userland/Services/WebContent/ConnectionFromClient.h
@@ -48,6 +48,7 @@ private:
     Web::Page& page();
     Web::Page const& page() const;
 
+    virtual void set_use_javascript_bytecode(bool) override;
     virtual Messages::WebContentServer::GetWindowHandleResponse get_window_handle() override;
     virtual void set_window_handle(String const& handle) override;
     virtual void connect_to_webdriver(DeprecatedString const& webdriver_ipc_path) override;
diff --git a/Userland/Services/WebContent/WebContentServer.ipc b/Userland/Services/WebContent/WebContentServer.ipc
index 072b887a29c..65f92cbe7e8 100644
--- a/Userland/Services/WebContent/WebContentServer.ipc
+++ b/Userland/Services/WebContent/WebContentServer.ipc
@@ -9,6 +9,9 @@
 
 endpoint WebContentServer
 {
+    // NOTE: This is only used on SerenityOS when attaching to a WebContent process served by SystemServer.
+    set_use_javascript_bytecode(bool use_javascript_bytecode) =|
+
     get_window_handle() => (String handle)
     set_window_handle(String handle) =|