Examine source code of Ice 3 Train

{
  "theme": {
    "images": {
      "theme_frame": "ICE3Train-Header.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Ice 3 Train",
  "manifest_version": 2,
  "description": "Works fine if all 3 toolbars are activated(menu toolbar,bookmarks toolbar and navigation toolbar)"
}