Yes:
This Custom CSS will remove the header up top and put the settings, add, and reload buttons on the bottom right. That's what I do, as they are pretty unobtrusive on when moved down there. Usually I keep my dashboard "locked down" from the app settings, so I only see the reload (green check) button.
If you want to change the size, edit the zoom and moz-transform:scale() values. I think this feature works great for moving the top controls. and allowing the dashboard to take up the whole screen.
I wouldn't completely remove them, since then it's difficult to change anything in the future. I think there's a way, but I like having those controls show up when needed, which is why I use the "lock down dashboard" feature.
