Examine source code of Silver back

{
  "theme": {
    "images": {
      "theme_frame": "Untitled-2.jpg"
    },
    "colors": {
      "frame": "#ad2c10",
      "tab_background_text": "#05193b"
    }
  },
  "version": "2.0",
  "name": "Silver back",
  "manifest_version": 2,
  "description": "Gintama"
}