As per my first impression, the design is designed keeping mobile (tablet) user in mind. It neat and clean with minimal options on the screen. It even comes with animations. I don’t have complains regarding that.
Being a loyal Mozilla Fan, I am very excited to say that soon we will be seeing new user-interface (UI) of Mozilla Firefox. Under code-name “Australis“, the next iteration of Mozilla Firefox UI claims to have “the most beautiful and detail visual design with modern, clean and comfortable.”