If this isn't Firefox, then I'm Batman's missing son... -.-

It's okay that you get inspiration from a great product and use it to make something, but then it's common courtesy to at least credit the original creators. When you copy this much from an existing product (you could at least bother to create a different skin for it...), that's the LEAST you could do. And you even have the cheek to release it as your own, under the name CometBird!!?