diff --git a/Libraries/LibWebView/Settings.cpp b/Libraries/LibWebView/Settings.cpp
index 0f0e6e752c..f7a197ebdb 100644
--- a/Libraries/LibWebView/Settings.cpp
+++ b/Libraries/LibWebView/Settings.cpp
@@ -60,7 +60,15 @@ static constexpr auto DNS_SETTINGS_KEY = "dnsSettings"sv;
 
 static constexpr auto CONFIG_VARIABLES_KEY = "configVariables"sv;
 
-static Array<ConfigVariableDefinition, static_cast<size_t>(ConfigVariableID::Count)> const CONFIG_VARIABLE_DEFINITIONS {};
+static Array<ConfigVariableDefinition, static_cast<size_t>(ConfigVariableID::Count)> const CONFIG_VARIABLE_DEFINITIONS { {
+    {
+        .id = ConfigVariableID::ShowWebContentProcessIDInTabTitle,
+        .name = "debug.process.show_web_content_process_id"sv,
+        .title = "Show WebContent process ID in tab titles"sv,
+        .description = "Append the active WebContent process ID to each tab title and tooltip."sv,
+        .default_value = false,
+    },
+} };
 
 ReadonlySpan<ConfigVariableDefinition const> config_variable_definitions()
 {
diff --git a/Libraries/LibWebView/Settings.h b/Libraries/LibWebView/Settings.h
index 5e6ad99de0..19ca31205f 100644
--- a/Libraries/LibWebView/Settings.h
+++ b/Libraries/LibWebView/Settings.h
@@ -44,6 +44,7 @@ enum class GlobalPrivacyControl {
 };
 
 enum class ConfigVariableID : u8 {
+    ShowWebContentProcessIDInTabTitle,
     Count,
 };
 
diff --git a/Libraries/LibWebView/ViewImplementation.h b/Libraries/LibWebView/ViewImplementation.h
index 034ff8b581..39a04dfd0c 100644
--- a/Libraries/LibWebView/ViewImplementation.h
+++ b/Libraries/LibWebView/ViewImplementation.h
@@ -277,6 +277,9 @@ public:
     Action& toggle_bookmark_action() { return *m_toggle_bookmark_action; }
     Action& reset_zoom_action() { return *m_reset_zoom_action; }
 
+    WebContentClient& client();
+    WebContentClient const& client() const;
+
     virtual Web::DevicePixelSize viewport_size() const = 0;
     virtual Gfx::IntPoint to_content_position(Gfx::IntPoint widget_position) const = 0;
     virtual Gfx::IntPoint to_widget_position(Gfx::IntPoint content_position) const = 0;
@@ -288,8 +291,6 @@ protected:
 
     ViewImplementation();
 
-    WebContentClient& client();
-    WebContentClient const& client() const;
     u64 page_id() const;
 
     void set_url(URL::URL);
diff --git a/UI/AppKit/Interface/Tab.mm b/UI/AppKit/Interface/Tab.mm
index 1e52d3bd0b..2698d169b1 100644
--- a/UI/AppKit/Interface/Tab.mm
+++ b/UI/AppKit/Interface/Tab.mm
@@ -4,12 +4,15 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/Function.h>
+#include <AK/OwnPtr.h>
 #include <AK/String.h>
 #include <LibCore/Resource.h>
 #include <LibURL/URL.h>
 #include <LibWebView/Application.h>
 #include <LibWebView/Settings.h>
 #include <LibWebView/ViewImplementation.h>
+#include <LibWebView/WebContentClient.h>
 
 #import <Application/ApplicationDelegate.h>
 #import <Interface/BookmarksBar.h>
@@ -28,6 +31,22 @@ static constexpr CGFloat const WINDOW_HEIGHT = 800;
 static constexpr CGFloat const TAB_ICON_SIZE = 16;
 static constexpr NSUInteger const TAB_LOADING_SPINNER_SEGMENT_COUNT = 12;
 
+class TabSettingsObserver final : public WebView::SettingsObserver {
+public:
+    explicit TabSettingsObserver(Function<void(WebView::ConfigVariableID)> callback)
+        : m_callback(move(callback))
+    {
+    }
+
+    virtual void config_variable_changed(WebView::ConfigVariableID variable) override
+    {
+        m_callback(variable);
+    }
+
+private:
+    Function<void(WebView::ConfigVariableID)> m_callback;
+};
+
 static NSImage* tab_loading_spinner_icon(NSUInteger frame)
 {
     auto* image = [NSImage imageWithSize:NSMakeSize(TAB_ICON_SIZE, TAB_ICON_SIZE)
@@ -66,6 +85,7 @@ static NSImage* tab_loading_spinner_icon(NSUInteger frame)
     BOOL m_loading;
     NSUInteger m_loading_spinner_frame;
     __strong NSTimer* m_loading_spinner_timer;
+    OwnPtr<TabSettingsObserver> m_settings_observer;
 }
 
 @property (nonatomic, strong) NSString* title;
@@ -121,6 +141,15 @@ static NSImage* tab_loading_spinner_icon(NSUInteger frame)
 
         self.favicon = [Tab defaultFavicon];
         self.title = @"New Tab";
+        __weak Tab* weak_self = self;
+        m_settings_observer = make<TabSettingsObserver>([weak_self](WebView::ConfigVariableID variable) {
+            if (variable != WebView::ConfigVariableID::ShowWebContentProcessIDInTabTitle)
+                return;
+            Tab* strong_self = weak_self;
+            if (strong_self == nil)
+                return;
+            [strong_self updateTabTitleAndFavicon];
+        });
         [self updateTabTitleAndFavicon];
 
         [self setTitleVisibility:NSWindowTitleHidden];
@@ -193,6 +222,15 @@ static NSImage* tab_loading_spinner_icon(NSUInteger frame)
     return self.favicon;
 }
 
+- (NSString*)displayTitle
+{
+    if (!WebView::Application::settings().config_variable_as_bool(WebView::ConfigVariableID::ShowWebContentProcessIDInTabTitle))
+        return self.title;
+
+    auto title = MUST(String::formatted("{} [{}]", Ladybird::ns_string_to_string(self.title), [[self web_view] view].client().pid()));
+    return Ladybird::string_to_ns_string(title);
+}
+
 - (void)updateLoadingSpinner
 {
     if (!m_loading)
@@ -255,7 +293,8 @@ static NSImage* tab_loading_spinner_icon(NSUInteger frame)
         NSFontAttributeName : title_font
     };
 
-    auto* title_attribute = [[NSAttributedString alloc] initWithString:self.title
+    auto* display_title = [self displayTitle];
+    auto* title_attribute = [[NSAttributedString alloc] initWithString:display_title
                                                             attributes:title_attributes];
 
     auto* spacing_attribute = [[NSAttributedString alloc] initWithString:@"  "
@@ -267,6 +306,8 @@ static NSImage* tab_loading_spinner_icon(NSUInteger frame)
     [title_and_favicon appendAttributedString:title_attribute];
 
     [[self tab] setAttributedTitle:title_and_favicon];
+    if ([[self tab] respondsToSelector:@selector(setToolTip:)])
+        [(id)[self tab] setToolTip:display_title];
 }
 
 - (void)togglePageMuteState:(id)button
diff --git a/UI/Gtk/Tab.cpp b/UI/Gtk/Tab.cpp
index 72dd8979e9..7a8a857d04 100644
--- a/UI/Gtk/Tab.cpp
+++ b/UI/Gtk/Tab.cpp
@@ -8,8 +8,10 @@
 #include <LibGfx/Cursor.h>
 #include <LibURL/URL.h>
 #include <LibWeb/HTML/SelectItem.h>
+#include <LibWebView/Application.h>
 #include <LibWebView/Menu.h>
 #include <LibWebView/URL.h>
+#include <LibWebView/WebContentClient.h>
 #include <UI/Gtk/BrowserWindow.h>
 #include <UI/Gtk/Dialogs.h>
 #include <UI/Gtk/Events.h>
@@ -89,16 +91,20 @@ Tab::Tab(BrowserWindow& window, RefPtr<WebView::WebContentClient> parent_client,
 
 Tab::~Tab() = default;
 
+void Tab::set_tab_page(AdwTabPage* page)
+{
+    m_tab_page = page;
+    update_tab_title();
+}
+
 void Tab::setup_callbacks()
 {
     auto* root = GTK_WIDGET(m_web_view);
 
     m_view->on_title_change = [this](auto const& title) {
-        if (m_tab_page) {
-            auto utf8 = title.to_utf8();
-            auto byte_str = ByteString(utf8.bytes_as_string_view());
-            adw_tab_page_set_title(m_tab_page, byte_str.characters());
-        }
+        auto utf8 = title.to_utf8();
+        m_title = ByteString(utf8.bytes_as_string_view());
+        update_tab_title();
     };
 
     m_view->on_url_change = [this](auto const& url) {
@@ -273,6 +279,30 @@ void Tab::setup_callbacks()
     create_context_menu(*root, *m_view, m_view->media_context_menu());
 }
 
+ByteString Tab::tab_title() const
+{
+    if (!WebView::Application::settings().config_variable_as_bool(WebView::ConfigVariableID::ShowWebContentProcessIDInTabTitle))
+        return m_title;
+
+    return ByteString::formatted("{} [{}]", m_title, m_view->client().pid());
+}
+
+void Tab::update_tab_title()
+{
+    if (!m_tab_page)
+        return;
+
+    auto title = tab_title();
+    adw_tab_page_set_title(m_tab_page, title.characters());
+    adw_tab_page_set_tooltip(m_tab_page, title.characters());
+}
+
+void Tab::config_variable_changed(WebView::ConfigVariableID variable)
+{
+    if (variable == WebView::ConfigVariableID::ShowWebContentProcessIDInTabTitle)
+        update_tab_title();
+}
+
 void Tab::navigate(URL::URL const& url)
 {
     m_view->load(url);
diff --git a/UI/Gtk/Tab.h b/UI/Gtk/Tab.h
index 2f04fc2528..5f0b62c007 100644
--- a/UI/Gtk/Tab.h
+++ b/UI/Gtk/Tab.h
@@ -14,6 +14,7 @@
 #include <LibWeb/HTML/ActivateTab.h>
 #include <LibWeb/HTML/SelectItem.h>
 #include <LibWebView/Forward.h>
+#include <LibWebView/Settings.h>
 #include <UI/Gtk/GLibPtr.h>
 #include <UI/Gtk/Widgets/LadybirdWebView.h>
 
@@ -24,11 +25,11 @@ namespace Ladybird {
 class BrowserWindow;
 class WebContentView;
 
-class Tab {
+class Tab : public WebView::SettingsObserver {
 public:
     Tab(BrowserWindow& window, URL::URL url = {});
     Tab(BrowserWindow& window, WebView::WebContentClient& parent_client, u64 page_index);
-    ~Tab();
+    virtual ~Tab() override;
 
     GtkWidget* widget() const { return GTK_WIDGET(m_web_view); }
     WebContentView& view() { return *m_view; }
@@ -39,11 +40,14 @@ public:
     bool is_loading() const { return m_is_loading; }
 
     AdwTabPage* tab_page() const { return m_tab_page; }
-    void set_tab_page(AdwTabPage* page) { m_tab_page = page; }
+    void set_tab_page(AdwTabPage*);
 
 private:
     Tab(BrowserWindow& window, RefPtr<WebView::WebContentClient> parent_client, size_t page_index);
     void setup_callbacks();
+    void update_tab_title();
+    ByteString tab_title() const;
+    virtual void config_variable_changed(WebView::ConfigVariableID) override;
     void show_select_dropdown(Gfx::IntPoint content_position, i32 minimum_width, Vector<Web::HTML::SelectItem> items);
 
     BrowserWindow& m_window;
@@ -53,6 +57,7 @@ private:
     AdwTabPage* m_tab_page { nullptr };
 
     URL::URL m_initial_url;
+    ByteString m_title { "New Tab" };
     GObjectPtr<GdkPaintable> m_favicon;
     bool m_is_loading { false };
 };
diff --git a/UI/Qt/Tab.cpp b/UI/Qt/Tab.cpp
index f338ab94fd..a4b625b2a6 100644
--- a/UI/Qt/Tab.cpp
+++ b/UI/Qt/Tab.cpp
@@ -10,6 +10,7 @@
 #include <LibWeb/HTML/SelectedFile.h>
 #include <LibWebView/Application.h>
 #include <LibWebView/Utilities.h>
+#include <LibWebView/WebContentClient.h>
 #include <UI/Qt/BrowserWindow.h>
 #include <UI/Qt/Icon.h>
 #include <UI/Qt/Menu.h>
@@ -184,7 +185,7 @@ Tab::Tab(BrowserWindow* window, RefPtr<WebView::WebContentClient> parent_client,
         auto url_serialized = qstring_from_ak_string(url.serialize());
 
         m_title = url_serialized;
-        emit title_changed(tab_index(), url_serialized);
+        update_tab_title();
 
         m_favicon = default_favicon();
         set_loading(true);
@@ -213,7 +214,7 @@ Tab::Tab(BrowserWindow* window, RefPtr<WebView::WebContentClient> parent_client,
 
     view().on_title_change = [this](auto const& title) {
         m_title = qstring_from_utf16_string(title);
-        emit title_changed(tab_index(), m_title);
+        update_tab_title();
     };
 
     view().on_favicon_change = [this](auto const& bitmap) {
@@ -525,6 +526,25 @@ QIcon Tab::tab_icon() const
     return m_favicon;
 }
 
+QString Tab::title() const
+{
+    if (!WebView::Application::settings().config_variable_as_bool(WebView::ConfigVariableID::ShowWebContentProcessIDInTabTitle))
+        return m_title;
+
+    return QString("%1 [%2]").arg(m_title).arg(view().client().pid());
+}
+
+void Tab::update_tab_title()
+{
+    emit title_changed(tab_index(), title());
+}
+
+void Tab::config_variable_changed(WebView::ConfigVariableID variable)
+{
+    if (variable == WebView::ConfigVariableID::ShowWebContentProcessIDInTabTitle)
+        update_tab_title();
+}
+
 void Tab::set_loading(bool is_loading)
 {
     if (m_is_loading == is_loading)
diff --git a/UI/Qt/Tab.h b/UI/Qt/Tab.h
index d99c4ce8e3..8dc8132b2d 100644
--- a/UI/Qt/Tab.h
+++ b/UI/Qt/Tab.h
@@ -8,6 +8,7 @@
 #pragma once
 
 #include <LibWeb/HTML/AudioPlayState.h>
+#include <LibWebView/Settings.h>
 #include <UI/Qt/BookmarksBar.h>
 #include <UI/Qt/FindInPageWidget.h>
 #include <UI/Qt/LocationEdit.h>
@@ -46,7 +47,9 @@ signals:
     void mouse_entered(QEnterEvent*);
 };
 
-class Tab final : public QWidget {
+class Tab final
+    : public QWidget
+    , public WebView::SettingsObserver {
     Q_OBJECT
 
 public:
@@ -54,6 +57,7 @@ public:
     virtual ~Tab() override;
 
     WebContentView& view() { return *m_view; }
+    WebContentView const& view() const { return *m_view; }
 
     void navigate(URL::URL const&);
     void load_html(StringView);
@@ -70,7 +74,7 @@ public:
 
     QIcon const& favicon() const { return m_favicon; }
     QIcon tab_icon() const;
-    QString const& title() const { return m_title; }
+    QString title() const;
 
     QMenu* context_menu() const { return m_context_menu; }
 
@@ -93,8 +97,10 @@ signals:
 private:
     virtual void resizeEvent(QResizeEvent*) override;
     virtual bool event(QEvent*) override;
+    virtual void config_variable_changed(WebView::ConfigVariableID) override;
 
     void recreate_toolbar_icons();
+    void update_tab_title();
     void set_loading(bool);
     void update_tab_icon();
     int tab_index();