diff --git a/Ladybird/AppKit/Application/ApplicationDelegate.mm b/Ladybird/AppKit/Application/ApplicationDelegate.mm
index fcbc5cc6755..70dd2a0e592 100644
--- a/Ladybird/AppKit/Application/ApplicationDelegate.mm
+++ b/Ladybird/AppKit/Application/ApplicationDelegate.mm
@@ -32,6 +32,7 @@
     Web::CSS::PreferredColorScheme m_preferred_color_scheme;
     Web::CSS::PreferredContrast m_preferred_contrast;
     Web::CSS::PreferredMotion m_preferred_motion;
+    ByteString m_navigator_compatibility_mode;
 
     WebView::SearchEngine m_search_engine;
 }
@@ -92,6 +93,7 @@
         m_preferred_color_scheme = Web::CSS::PreferredColorScheme::Auto;
         m_preferred_contrast = Web::CSS::PreferredContrast::Auto;
         m_preferred_motion = Web::CSS::PreferredMotion::Auto;
+        m_navigator_compatibility_mode = "chrome";
         m_search_engine = WebView::default_search_engine();
 
         // Reduce the tooltip delay, as the default delay feels quite long.
@@ -663,6 +665,23 @@
     [spoof_user_agent_menu_item setSubmenu:spoof_user_agent_menu];
 
     [submenu addItem:spoof_user_agent_menu_item];
+
+    auto* navigator_compatibility_mode_menu = [[NSMenu alloc] init];
+    auto add_navigator_compatibility_mode = [navigator_compatibility_mode_menu](ByteString name) {
+        [navigator_compatibility_mode_menu addItem:[[NSMenuItem alloc] initWithTitle:Ladybird::string_to_ns_string(name)
+                                                                              action:@selector(setNavigatorCompatibilityMode:)
+                                                                       keyEquivalent:@""]];
+    };
+    add_navigator_compatibility_mode("Chrome");
+    add_navigator_compatibility_mode("Gecko");
+    add_navigator_compatibility_mode("WebKit");
+
+    auto* navigator_compatibility_mode_menu_item = [[NSMenuItem alloc] initWithTitle:@"Navigator Compatibility Mode"
+                                                                              action:nil
+                                                                       keyEquivalent:@""];
+    [navigator_compatibility_mode_menu_item setSubmenu:navigator_compatibility_mode_menu];
+
+    [submenu addItem:navigator_compatibility_mode_menu_item];
     [submenu addItem:[NSMenuItem separatorItem]];
 
     [submenu addItem:[[NSMenuItem alloc] initWithTitle:@"Enable Scripting"
diff --git a/Ladybird/AppKit/UI/TabController.h b/Ladybird/AppKit/UI/TabController.h
index 69993ae1efa..2ea99895c2c 100644
--- a/Ladybird/AppKit/UI/TabController.h
+++ b/Ladybird/AppKit/UI/TabController.h
@@ -17,6 +17,7 @@ struct TabSettings {
     BOOL block_popups { YES };
     BOOL same_origin_policy_enabled { NO };
     ByteString user_agent_name { "Disabled"sv };
+    ByteString navigator_compatibility_mode { "chrome"sv };
 };
 
 @interface TabController : NSWindowController <NSWindowDelegate>
diff --git a/Ladybird/AppKit/UI/TabController.mm b/Ladybird/AppKit/UI/TabController.mm
index 437bdb44c87..c190d364a3e 100644
--- a/Ladybird/AppKit/UI/TabController.mm
+++ b/Ladybird/AppKit/UI/TabController.mm
@@ -367,6 +367,14 @@ static NSString* const TOOLBAR_TAB_OVERVIEW_IDENTIFIER = @"ToolbarTabOverviewIde
     [self debugRequest:"clear-cache" argument:""]; // clear the cache to ensure requests are re-done with the new user agent
 }
 
+- (void)setNavigatorCompatibilityMode:(NSMenuItem*)sender
+{
+    ByteString const compatibility_mode = [[[sender title] lowercaseString] UTF8String];
+    m_settings.navigator_compatibility_mode = compatibility_mode;
+
+    [self debugRequest:"navigator-compatibility-mode" argument:compatibility_mode];
+}
+
 #pragma mark - Properties
 
 - (NSButton*)create_button:(NSImageName)image
@@ -574,6 +582,8 @@ static NSString* const TOOLBAR_TAB_OVERVIEW_IDENTIFIER = @"ToolbarTabOverviewIde
         [item setState:m_settings.same_origin_policy_enabled ? NSControlStateValueOn : NSControlStateValueOff];
     } else if ([item action] == @selector(setUserAgentSpoof:)) {
         [item setState:(m_settings.user_agent_name == [[item title] UTF8String]) ? NSControlStateValueOn : NSControlStateValueOff];
+    } else if ([item action] == @selector(setNavigatorCompatibilityMode:)) {
+        [item setState:(m_settings.navigator_compatibility_mode == [[[item title] lowercaseString] UTF8String]) ? NSControlStateValueOn : NSControlStateValueOff];
     }
 
     return YES;