Examine source code of Blackjetta

{
  "theme": {
    "images": {
      "theme_frame": "jetta2.jpg"
    },
    "colors": {
      "frame": "#e1d4df",
      "tab_background_text": "#e1d4df"
    }
  },
  "version": "2.0",
  "name": "Blackjetta",
  "manifest_version": 2,
  "description": "Jepa"
}