[Gozar]

Рабочий код будет такой:

for (var propertyName in window) {
console.log(propertyName);
		if (propertyName != 'sessionStorage' && propertyName != 'mozIndexedDB'){
			var propertyType;
			propertyType = typeof(window[propertyName]);
			switch (propertyType) {
				case "string":
					console.log("String " + propertyType);
					break;
				case "number":
					console.log("Number " + propertyType);
					break;
				default:
					console.log("Default " + propertyType);
			}
		}
	}

Дебаг строка: console.log(propertyName);