Build: Add Xcode project files and gitignore

.gitignore

@@ -0,0 +1,39 @@
+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## Build generated
+build/
+DerivedData/
+
+## Various settings
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+
+## Other
+*.moved-aside
+*.xccheckout
+*.xcscmblueprint
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+# Playgrounds
+timeline.xctimeline
+playground.xcworkspace
+
+# Swift Package Manager
+.build/
+
+# CocoaPods
+Pods/

XcodeProject/Light Theme for YouTube Music/Light Theme for YouTube Music Extension/Info.plist

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.Safari.web-extension</string>
+		<key>NSExtensionPrincipalClass</key>
+		<string>$(PRODUCT_MODULE_NAME).SafariWebExtensionHandler</string>
+	</dict>
+</dict>
+</plist>

XcodeProject/Light Theme for YouTube Music/Light Theme for YouTube Music Extension/SafariWebExtensionHandler.swift

@@ -0,0 +1,42 @@
+//
+//  SafariWebExtensionHandler.swift
+//  Light Theme for YouTube Music Extension
+//
+//  Created by Murad Jabir on 2026-09-17.
+//
+
+import SafariServices
+import os.log
+
+class SafariWebExtensionHandler: NSObject, NSExtensionRequestHandling {
+
+    func beginRequest(with context: NSExtensionContext) {
+        let request = context.inputItems.first as? NSExtensionItem
+
+        let profile: UUID?
+        if #available(iOS 17.0, macOS 14.0, *) {
+            profile = request?.userInfo?[SFExtensionProfileKey] as? UUID
+        } else {
+            profile = request?.userInfo?["profile"] as? UUID
+        }
+
+        let message: Any?
+        if #available(iOS 15.0, macOS 11.0, *) {
+            message = request?.userInfo?[SFExtensionMessageKey]
+        } else {
+            message = request?.userInfo?["message"]
+        }
+
+        os_log(.default, "Received message from browser.runtime.sendNativeMessage: %@ (profile: %@)", String(describing: message), profile?.uuidString ?? "none")
+
+        let response = NSExtensionItem()
+        if #available(iOS 15.0, macOS 11.0, *) {
+            response.userInfo = [ SFExtensionMessageKey: [ "echo": message ] ]
+        } else {
+            response.userInfo = [ "message": [ "echo": message ] ]
+        }
+
+        context.completeRequest(returningItems: [ response ], completionHandler: nil)
+    }
+
+}

XcodeProject/Light Theme for YouTube Music/Light Theme for YouTube Music.xcodeproj/project.pbxproj

@@ -0,0 +1,585 @@
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+				CAE60EB5305BDC330019BD54 /* Light Theme for YouTube Music Extension */,
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+				CAE60EB1305BDC330019BD54 /* Light Theme for YouTube Music Extension.appex */,
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+				CAE60EA1305BDC330019BD54 /* Style.css */,
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+			);
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+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				MACOSX_DEPLOYMENT_TARGET = 27.0;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				MTL_FAST_MATH = YES;
+				SDKROOT = macosx;
+				SWIFT_COMPILATION_MODE = wholemodule;
+			};
+			name = Release;
+		};
+		CAE60EBC305BDC330019BD54 /* Debug configuration for PBXNativeTarget "Light Theme for YouTube Music Extension" */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				ENABLE_APP_SANDBOX = YES;
+				ENABLE_HARDENED_RUNTIME = YES;
+				ENABLE_USER_SELECTED_FILES = readonly;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = "Light Theme for YouTube Music Extension/Info.plist";
+				INFOPLIST_KEY_CFBundleDisplayName = "Light Theme for YouTube Music Extension";
+				INFOPLIST_KEY_NSHumanReadableCopyright = "";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/../Frameworks",
+					"@executable_path/../../../../Frameworks",
+				);
+				MACOSX_DEPLOYMENT_TARGET = 12.0;
+				MARKETING_VERSION = 1.0;
+				OTHER_LDFLAGS = (
+					"-framework",
+					SafariServices,
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = "com.yourCompany.Light-Theme-for-YouTube-Music.Extension";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SKIP_INSTALL = YES;
+				STRING_CATALOG_GENERATE_SYMBOLS = YES;
+				SWIFT_APPROACHABLE_CONCURRENCY = YES;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY = YES;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Debug;
+		};
+		CAE60EBD305BDC330019BD54 /* Release configuration for PBXNativeTarget "Light Theme for YouTube Music Extension" */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				ENABLE_APP_SANDBOX = YES;
+				ENABLE_HARDENED_RUNTIME = YES;
+				ENABLE_USER_SELECTED_FILES = readonly;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = "Light Theme for YouTube Music Extension/Info.plist";
+				INFOPLIST_KEY_CFBundleDisplayName = "Light Theme for YouTube Music Extension";
+				INFOPLIST_KEY_NSHumanReadableCopyright = "";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/../Frameworks",
+					"@executable_path/../../../../Frameworks",
+				);
+				MACOSX_DEPLOYMENT_TARGET = 12.0;
+				MARKETING_VERSION = 1.0;
+				OTHER_LDFLAGS = (
+					"-framework",
+					SafariServices,
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = "com.yourCompany.Light-Theme-for-YouTube-Music.Extension";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SKIP_INSTALL = YES;
+				STRING_CATALOG_GENERATE_SYMBOLS = YES;
+				SWIFT_APPROACHABLE_CONCURRENCY = YES;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY = YES;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Release;
+		};
+		CAE60EC0305BDC330019BD54 /* Debug configuration for PBXNativeTarget "Light Theme for YouTube Music" */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CODE_SIGN_STYLE = Automatic;
+				COMBINE_HIDPI_IMAGES = YES;
+				CURRENT_PROJECT_VERSION = 1;
+				ENABLE_APP_SANDBOX = YES;
+				ENABLE_HARDENED_RUNTIME = YES;
+				ENABLE_OUTGOING_NETWORK_CONNECTIONS = YES;
+				ENABLE_USER_SELECTED_FILES = readonly;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = "Light Theme for YouTube Music/Info.plist";
+				INFOPLIST_KEY_CFBundleDisplayName = "Light Theme for YouTube Music";
+				INFOPLIST_KEY_NSHumanReadableCopyright = "";
+				INFOPLIST_KEY_NSMainStoryboardFile = Main;
+				INFOPLIST_KEY_NSPrincipalClass = NSApplication;
+				INFOPLIST_KEY_NSViewGestureRecognizerIsExclusive = NO;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/../Frameworks",
+				);
+				MARKETING_VERSION = 1.0;
+				OTHER_LDFLAGS = (
+					"-framework",
+					SafariServices,
+					"-framework",
+					WebKit,
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = "com.yourCompany.Light-Theme-for-YouTube-Music";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				REGISTER_APP_GROUPS = YES;
+				STRING_CATALOG_GENERATE_SYMBOLS = YES;
+				SWIFT_APPROACHABLE_CONCURRENCY = YES;
+				SWIFT_DEFAULT_ACTOR_ISOLATION = MainActor;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY = YES;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Debug;
+		};
+		CAE60EC1305BDC330019BD54 /* Release configuration for PBXNativeTarget "Light Theme for YouTube Music" */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CODE_SIGN_STYLE = Automatic;
+				COMBINE_HIDPI_IMAGES = YES;
+				CURRENT_PROJECT_VERSION = 1;
+				ENABLE_APP_SANDBOX = YES;
+				ENABLE_HARDENED_RUNTIME = YES;
+				ENABLE_OUTGOING_NETWORK_CONNECTIONS = YES;
+				ENABLE_USER_SELECTED_FILES = readonly;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = "Light Theme for YouTube Music/Info.plist";
+				INFOPLIST_KEY_CFBundleDisplayName = "Light Theme for YouTube Music";
+				INFOPLIST_KEY_NSHumanReadableCopyright = "";
+				INFOPLIST_KEY_NSMainStoryboardFile = Main;
+				INFOPLIST_KEY_NSPrincipalClass = NSApplication;
+				INFOPLIST_KEY_NSViewGestureRecognizerIsExclusive = NO;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/../Frameworks",
+				);
+				MARKETING_VERSION = 1.0;
+				OTHER_LDFLAGS = (
+					"-framework",
+					SafariServices,
+					"-framework",
+					WebKit,
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = "com.yourCompany.Light-Theme-for-YouTube-Music";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				REGISTER_APP_GROUPS = YES;
+				STRING_CATALOG_GENERATE_SYMBOLS = YES;
+				SWIFT_APPROACHABLE_CONCURRENCY = YES;
+				SWIFT_DEFAULT_ACTOR_ISOLATION = MainActor;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY = YES;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		CAE60E91305BDC330019BD54 /* Build configuration list for PBXProject "Light Theme for YouTube Music" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				CAE60EB9305BDC330019BD54 /* Debug configuration for PBXProject "Light Theme for YouTube Music" */,
+				CAE60EBA305BDC330019BD54 /* Release configuration for PBXProject "Light Theme for YouTube Music" */,
+			);
+			defaultConfigurationName = Release;
+		};
+		CAE60EBB305BDC330019BD54 /* Build configuration list for PBXNativeTarget "Light Theme for YouTube Music Extension" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				CAE60EBC305BDC330019BD54 /* Debug configuration for PBXNativeTarget "Light Theme for YouTube Music Extension" */,
+				CAE60EBD305BDC330019BD54 /* Release configuration for PBXNativeTarget "Light Theme for YouTube Music Extension" */,
+			);
+			defaultConfigurationName = Release;
+		};
+		CAE60EBF305BDC330019BD54 /* Build configuration list for PBXNativeTarget "Light Theme for YouTube Music" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				CAE60EC0305BDC330019BD54 /* Debug configuration for PBXNativeTarget "Light Theme for YouTube Music" */,
+				CAE60EC1305BDC330019BD54 /* Release configuration for PBXNativeTarget "Light Theme for YouTube Music" */,
+			);
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = CAE60E8E305BDC330019BD54 /* Project object */;
+	validationLevel = 1;
+}

XcodeProject/Light Theme for YouTube Music/Light Theme for YouTube Music.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

XcodeProject/Light Theme for YouTube Music/Light Theme for YouTube Music/AppDelegate.swift

@@ -0,0 +1,21 @@
+//
+//  AppDelegate.swift
+//  Light Theme for YouTube Music
+//
+//  Created by Murad Jabir on 2026-09-17.
+//
+
+import Cocoa
+
+@main
+class AppDelegate: NSObject, NSApplicationDelegate {
+
+    func applicationDidFinishLaunching(_ notification: Notification) {
+        // Override point for customization after application launch.
+    }
+
+    func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
+        return true
+    }
+
+}

XcodeProject/Light Theme for YouTube Music/Light Theme for YouTube Music/Assets.xcassets/AccentColor.colorset/Contents.json

@@ -0,0 +1,11 @@
+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

XcodeProject/Light Theme for YouTube Music/Light Theme for YouTube Music/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,68 @@
+{
+  "images" : [
+    {
+      "size" : "16x16",
+      "idiom" : "mac",
+      "filename" : "mac-icon-16@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "16x16",
+      "idiom" : "mac",
+      "filename" : "mac-icon-16@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "32x32",
+      "idiom" : "mac",
+      "filename" : "mac-icon-32@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "32x32",
+      "idiom" : "mac",
+      "filename" : "mac-icon-32@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "128x128",
+      "idiom" : "mac",
+      "filename" : "mac-icon-128@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "128x128",
+      "idiom" : "mac",
+      "filename" : "mac-icon-128@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "256x256",
+      "idiom" : "mac",
+      "filename" : "mac-icon-256@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "256x256",
+      "idiom" : "mac",
+      "filename" : "mac-icon-256@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "512x512",
+      "idiom" : "mac",
+      "filename" : "mac-icon-512@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "512x512",
+      "idiom" : "mac",
+      "filename" : "mac-icon-512@2x.png",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

XcodeProject/Light Theme for YouTube Music/Light Theme for YouTube Music/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

XcodeProject/Light Theme for YouTube Music/Light Theme for YouTube Music/Assets.xcassets/LargeIcon.imageset/Contents.json

@@ -0,0 +1,20 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

XcodeProject/Light Theme for YouTube Music/Light Theme for YouTube Music/Base.lproj/Main.storyboard

@@ -0,0 +1,124 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.Cocoa.Storyboard.XIB" version="3.0" toolsVersion="19085" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" initialViewController="B8D-0N-5wS">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="19085"/>
+        <plugIn identifier="com.apple.WebKit2IBPlugin" version="19085"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--Application-->
+        <scene sceneID="JPo-4y-FX3">
+            <objects>
+                <application id="hnw-xV-0zn" sceneMemberID="viewController">
+                    <menu key="mainMenu" title="Main Menu" systemMenu="main" id="AYu-sK-qS6">
+                        <items>
+                            <menuItem title="Light Theme for YouTube Music" id="1Xt-HY-uBw">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="Light Theme for YouTube Music" systemMenu="apple" id="uQy-DD-JDr">
+                                    <items>
+                                        <menuItem title="About Light Theme for YouTube Music" id="5kV-Vb-QxS">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="orderFrontStandardAboutPanel:" target="Ady-hI-5gd" id="Exp-CZ-Vem"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="VOq-y0-SEH"/>
+                                        <menuItem title="Hide Light Theme for YouTube Music" keyEquivalent="h" id="Olw-nP-bQN">
+                                            <connections>
+                                                <action selector="hide:" target="Ady-hI-5gd" id="PnN-Uc-m68"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Hide Others" keyEquivalent="h" id="Vdr-fp-XzO">
+                                            <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
+                                            <connections>
+                                                <action selector="hideOtherApplications:" target="Ady-hI-5gd" id="VT4-aY-XCT"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Show All" id="Kd2-mp-pUS">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="unhideAllApplications:" target="Ady-hI-5gd" id="Dhg-Le-xox"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="kCx-OE-vgT"/>
+                                        <menuItem title="Quit Light Theme for YouTube Music" keyEquivalent="q" id="4sb-4s-VLi">
+                                            <connections>
+                                                <action selector="terminate:" target="Ady-hI-5gd" id="Te7-pn-YzF"/>
+                                            </connections>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                            <menuItem title="Help" id="wpr-3q-Mcd">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="Help" systemMenu="help" id="F2S-fz-NVQ">
+                                    <items>
+                                        <menuItem title="Light Theme for YouTube Music Help" keyEquivalent="?" id="FKE-Sm-Kum">
+                                            <connections>
+                                                <action selector="showHelp:" target="Ady-hI-5gd" id="y7X-2Q-9no"/>
+                                            </connections>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                        </items>
+                    </menu>
+                    <connections>
+                        <outlet property="delegate" destination="Voe-Tx-rLC" id="PrD-fu-P6m"/>
+                    </connections>
+                </application>
+                <customObject id="Voe-Tx-rLC" customClass="AppDelegate" customModuleProvider="target"/>
+                <customObject id="YLy-65-1bz" customClass="NSFontManager"/>
+                <customObject id="Ady-hI-5gd" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="76" y="-134"/>
+        </scene>
+        <!--Window Controller-->
+        <scene sceneID="R2V-B0-nI4">
+            <objects>
+                <windowController showSeguePresentationStyle="single" id="B8D-0N-5wS" sceneMemberID="viewController">
+                    <window key="window" title="Light Theme for YouTube Music" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" restorable="NO" releasedWhenClosed="NO" animationBehavior="default" id="IQv-IB-iLA">
+                        <windowStyleMask key="styleMask" titled="YES" closable="YES"/>
+                        <windowCollectionBehavior key="collectionBehavior" fullScreenNone="YES"/>
+                        <rect key="contentRect" x="196" y="240" width="425" height="325"/>
+                        <rect key="screenRect" x="0.0" y="0.0" width="1680" height="1027"/>
+                        <connections>
+                            <outlet property="delegate" destination="B8D-0N-5wS" id="98r-iN-zZc"/>
+                        </connections>
+                    </window>
+                    <connections>
+                        <segue destination="XfG-lQ-9wD" kind="relationship" relationship="window.shadowedContentViewController" id="cq2-FE-JQM"/>
+                    </connections>
+                </windowController>
+                <customObject id="Oky-zY-oP4" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="75" y="250"/>
+        </scene>
+        <!--View Controller-->
+        <scene sceneID="hIz-AP-VOD">
+            <objects>
+                <viewController id="XfG-lQ-9wD" customClass="ViewController" customModuleProvider="target" sceneMemberID="viewController">
+                    <view key="view" id="m2S-Jp-Qdl">
+                        <rect key="frame" x="0.0" y="0.0" width="425" height="325"/>
+                        <autoresizingMask key="autoresizingMask"/>
+                        <subviews>
+                            <wkWebView wantsLayer="YES" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="eOr-cG-IQY">
+                                <rect key="frame" x="0.0" y="0.0" width="425" height="325"/>
+                                <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                                <wkWebViewConfiguration key="configuration">
+                                    <audiovisualMediaTypes key="mediaTypesRequiringUserActionForPlayback" none="YES"/>
+                                    <wkPreferences key="preferences"/>
+                                </wkWebViewConfiguration>
+                            </wkWebView>
+                        </subviews>
+                    </view>
+                    <connections>
+                        <outlet property="webView" destination="eOr-cG-IQY" id="GFe-mU-dBY"/>
+                    </connections>
+                </viewController>
+                <customObject id="rPt-NT-nkU" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="75" y="655"/>
+        </scene>
+    </scenes>
+</document>

XcodeProject/Light Theme for YouTube Music/Light Theme for YouTube Music/Info.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SFSafariWebExtensionConverterVersion</key>
+	<string>27.0</string>
+</dict>
+</plist>

XcodeProject/Light Theme for YouTube Music/Light Theme for YouTube Music/Resources/Base.lproj/Main.html

@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+    <meta http-equiv="Content-Security-Policy" content="default-src 'self'">
+
+    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
+
+    <link rel="stylesheet" href="../Style.css">
+    <script src="../Script.js" defer></script>
+</head>
+<body>
+    <img src="../Icon.png" width="128" height="128" alt="Light Theme for YouTube Music Icon">
+    <p class="state-unknown">You can turn on Light Theme for YouTube Music’s extension in Safari Extensions preferences.</p>
+    <p class="state-on">Light Theme for YouTube Music’s extension is currently on. You can turn it off in Safari Extensions preferences.</p>
+    <p class="state-off">Light Theme for YouTube Music’s extension is currently off. You can turn it on in Safari Extensions preferences.</p>
+    <button class="open-preferences">Quit and Open Safari Extensions Preferences…</button>
+</body>
+</html>

XcodeProject/Light Theme for YouTube Music/Light Theme for YouTube Music/Resources/Script.js

@@ -0,0 +1,22 @@
+function show(enabled, useSettingsInsteadOfPreferences) {
+    if (useSettingsInsteadOfPreferences) {
+        document.getElementsByClassName('state-on')[0].innerText = "Light Theme for YouTube Music’s extension is currently on. You can turn it off in the Extensions section of Safari Settings.";
+        document.getElementsByClassName('state-off')[0].innerText = "Light Theme for YouTube Music’s extension is currently off. You can turn it on in the Extensions section of Safari Settings.";
+        document.getElementsByClassName('state-unknown')[0].innerText = "You can turn on Light Theme for YouTube Music’s extension in the Extensions section of Safari Settings.";
+        document.getElementsByClassName('open-preferences')[0].innerText = "Quit and Open Safari Settings…";
+    }
+
+    if (typeof enabled === "boolean") {
+        document.body.classList.toggle(`state-on`, enabled);
+        document.body.classList.toggle(`state-off`, !enabled);
+    } else {
+        document.body.classList.remove(`state-on`);
+        document.body.classList.remove(`state-off`);
+    }
+}
+
+function openPreferences() {
+    webkit.messageHandlers.controller.postMessage("open-preferences");
+}
+
+document.querySelector("button.open-preferences").addEventListener("click", openPreferences);

XcodeProject/Light Theme for YouTube Music/Light Theme for YouTube Music/Resources/Style.css

@@ -0,0 +1,45 @@
+* {
+    -webkit-user-select: none;
+    -webkit-user-drag: none;
+    cursor: default;
+}
+
+:root {
+    color-scheme: light dark;
+
+    --spacing: 20px;
+}
+
+html {
+    height: 100%;
+}
+
+body {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    flex-direction: column;
+
+    gap: var(--spacing);
+    margin: 0 calc(var(--spacing) * 2);
+    height: 100%;
+
+    font: -apple-system-short-body;
+    text-align: center;
+}
+
+body:not(.state-on, .state-off) :is(.state-on, .state-off) {
+    display: none;
+}
+
+body.state-on :is(.state-off, .state-unknown) {
+    display: none;
+}
+
+body.state-off :is(.state-on, .state-unknown) {
+    display: none;
+}
+
+button {
+    font-size: 1em;
+}

XcodeProject/Light Theme for YouTube Music/Light Theme for YouTube Music/ViewController.swift

@@ -0,0 +1,57 @@
+//
+//  ViewController.swift
+//  Light Theme for YouTube Music
+//
+//  Created by Murad Jabir on 2026-09-17.
+//
+
+import Cocoa
+import SafariServices
+import WebKit
+
+let extensionBundleIdentifier = "com.yourCompany.Light-Theme-for-YouTube-Music.Extension"
+
+class ViewController: NSViewController, WKNavigationDelegate, WKScriptMessageHandler {
+
+    @IBOutlet var webView: WKWebView!
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        self.webView.navigationDelegate = self
+
+        self.webView.configuration.userContentController.add(self, name: "controller")
+
+        self.webView.loadFileURL(Bundle.main.url(forResource: "Main", withExtension: "html")!, allowingReadAccessTo: Bundle.main.resourceURL!)
+    }
+
+    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
+        SFSafariExtensionManager.getStateOfSafariExtension(withIdentifier: extensionBundleIdentifier) { (state, error) in
+            guard let state = state, error == nil else {
+                // Insert code to inform the user that something went wrong.
+                return
+            }
+
+            DispatchQueue.main.async {
+                if #available(macOS 13, *) {
+                    webView.evaluateJavaScript("show(\(state.isEnabled), true)")
+                } else {
+                    webView.evaluateJavaScript("show(\(state.isEnabled), false)")
+                }
+            }
+        }
+    }
+
+    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
+        if (message.body as! String != "open-preferences") {
+            return;
+        }
+
+        SFSafariApplication.showPreferencesForExtension(withIdentifier: extensionBundleIdentifier) { error in
+            DispatchQueue.main.async {
+                NSApplication.shared.terminate(nil)
+            }
+        }
+    }
+
+}