Examine source code of metalico10

{
  "theme": {
    "images": {
      "theme_frame": "CopiadeMetal_Twist_103.jpg"
    },
    "colors": {
      "frame": "#f4f7f7",
      "tab_background_text": "#c0d5db"
    }
  },
  "version": "2.0",
  "name": "metalico10",
  "manifest_version": 2
}