Examine source code of Kali Theme

{
  "name": "Kali Theme",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "3d+images+of+nature-1.jpg"
    },
    "colors": {
      "frame": "rgba(172, 149, 77, 1)",
      "tab_background_text": "rgba(173, 99, 42, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9f3b4932-d4a4-454c-97da-9d824a83f54a}"
    }
  }
}