Examine source code of Smart Sky01

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ff0000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Smart Sky01",
  "manifest_version": 2,
  "description": "This is a optimized theme for 1920x1080 screens.\nYou have to activate the menu and bookmark bar \n(right click at the top of firefox window) to make the design fit your client."
}