diff --git a/packages/happy-dom/src/storage/Storage.ts b/packages/happy-dom/src/storage/Storage.ts
index e4d35aaac..e77bca8a9 100644
--- a/packages/happy-dom/src/storage/Storage.ts
+++ b/packages/happy-dom/src/storage/Storage.ts
@@ -8,49 +8,6 @@ import * as PropertySymbol from '../PropertySymbol.js';
 export default class Storage {
 	public [PropertySymbol.data]: { [key: string]: string } = {};
 
-	/**
-	 *
-	 */
-	constructor() {
-		const descriptors = Object.getOwnPropertyDescriptors(Storage.prototype);
-
-		Object.defineProperty(this, 'length', {
-			enumerable: false,
-			configurable: true,
-			get: descriptors['length'].get.bind(this)
-		});
-
-		Object.defineProperty(this, 'key', {
-			enumerable: false,
-			configurable: true,
-			value: descriptors['key'].value.bind(this)
-		});
-
-		Object.defineProperty(this, 'setItem', {
-			enumerable: false,
-			configurable: true,
-			value: descriptors['setItem'].value.bind(this)
-		});
-
-		Object.defineProperty(this, 'getItem', {
-			enumerable: false,
-			configurable: true,
-			value: descriptors['getItem'].value.bind(this)
-		});
-
-		Object.defineProperty(this, 'removeItem', {
-			enumerable: false,
-			configurable: true,
-			value: descriptors['removeItem'].value.bind(this)
-		});
-
-		Object.defineProperty(this, 'clear', {
-			enumerable: false,
-			configurable: true,
-			value: descriptors['clear'].value.bind(this)
-		});
-	}
-
 	/**
 	 * Returns length.
 	 *
diff --git a/packages/happy-dom/src/storage/StorageFactory.ts b/packages/happy-dom/src/storage/StorageFactory.ts
index b7bb4504a..499977746 100644
--- a/packages/happy-dom/src/storage/StorageFactory.ts
+++ b/packages/happy-dom/src/storage/StorageFactory.ts
@@ -15,8 +15,18 @@ export default class StorageFactory {
 		// Documentation for Proxy:
 		// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy
 		return new Proxy(new Storage(), {
-			get(storage: Storage, key: string): string {
+			get(storage: Storage, key: string): string | number | boolean | Function {
 				if (Storage.prototype.hasOwnProperty(key)) {
+					const descriptor = Object.getOwnPropertyDescriptor(Storage.prototype, key);
+					if (descriptor.value !== undefined) {
+						if (typeof descriptor.value === 'function') {
+							return storage[key].bind(storage);
+						}
+						return descriptor.value;
+					}
+					if (descriptor.get) {
+						return descriptor.get.call(storage);
+					}
 					return storage[key];
 				}
 				return storage[PropertySymbol.data][key];
@@ -30,7 +40,7 @@ export default class StorageFactory {
 			},
 			deleteProperty(storage: Storage, key: string): boolean {
 				if (Storage.prototype.hasOwnProperty(key)) {
-					return false;
+					return true;
 				}
 				return delete storage[PropertySymbol.data][key];
 			},
diff --git a/packages/happy-dom/src/window/BrowserWindow.ts b/packages/happy-dom/src/window/BrowserWindow.ts
index 14f2e0053..13a0e991e 100644
--- a/packages/happy-dom/src/window/BrowserWindow.ts
+++ b/packages/happy-dom/src/window/BrowserWindow.ts
@@ -1327,7 +1327,7 @@ export default class BrowserWindow extends EventTarget implements INodeJSGlobal
 	/**
 	 * Binds methods, getters and setters to a scope.
 	 *
-	 * Getters and setters need to be bound to show up in Object.getOwnPropertyNames(), which is something Vitest relies on.
+	 * Getters and setters need to be bound to show up in Object.getOwnPropertyNames(), which is something Vitest and GlobalRegistrator relies on.
 	 *
 	 * @see https://github.com/capricorn86/happy-dom/issues/1339
 	 */
diff --git a/packages/happy-dom/test/storage/Storage.test.ts b/packages/happy-dom/test/storage/Storage.test.ts
index cbc5f390a..cffa1a6da 100644
--- a/packages/happy-dom/test/storage/Storage.test.ts
+++ b/packages/happy-dom/test/storage/Storage.test.ts
@@ -147,5 +147,23 @@ describe('Storage', () => {
 			storage.getItem('key1');
 			expect(spy).toHaveBeenCalled();
 		});
+
+		it('Should be able to mock implementation once.', () => {
+			vi.spyOn(storage, 'getItem').mockImplementationOnce(() => 'mocked');
+			expect(storage.getItem('key1')).toBe('mocked');
+			expect(storage.getItem('key1')).toBe(null);
+
+			vi.spyOn(storage, 'setItem').mockImplementationOnce(() => {
+				throw new Error('error');
+			});
+
+			expect(() => storage.setItem('key1', 'value1')).toThrow('error');
+		});
+
+		it('Should be able to spy on prototype methods.', () => {
+			vi.spyOn(Storage.prototype, 'getItem').mockImplementation(() => 'mocked');
+
+			expect(storage.getItem('key1')).toBe('mocked');
+		});
 	});
 });
diff --git a/packages/jest-environment/test/javascript/JavaScript.test.ts b/packages/jest-environment/test/javascript/JavaScript.test.ts
index 311b56ecf..845fc9a04 100644
--- a/packages/jest-environment/test/javascript/JavaScript.test.ts
+++ b/packages/jest-environment/test/javascript/JavaScript.test.ts
@@ -146,4 +146,16 @@ describe('JavaScript', () => {
 		removeEventListener('click', eventListener);
 		clearTimeout(setTimeout(eventListener));
 	});
+
+	it('Should be able to spy on Window.localStorage methods.', () => {
+		jest.spyOn(Storage.prototype, 'getItem').mockImplementationOnce(() => 'mocked');
+		expect(localStorage.getItem('key1')).toBe('mocked');
+		expect(localStorage.getItem('key1')).toBe(null);
+
+		jest.spyOn(Storage.prototype, 'setItem').mockImplementationOnce(() => {
+			throw new Error('error');
+		});
+
+		expect(() => Storage.prototype.setItem('key1', 'value1')).toThrow('error');
+	});
 });