Better compact mode

[velocity787]

I've been bouncing around other browsers just to test and my favorite aside from Firefox is Helium. Helium has an extremely sleek-looking Compact mode where the address bar, site controls, tabs, and window controls are all in-line with each other across the top of the window. Bringing a similar design to Firefox and updating the current compact mode UI would be great. As it stands, the Compact UI in Firefox is too similar to Standard.