Examine source code of Indigo White

{
  "name": "Indigo White",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "1000075261.png"
    },
    "colors": {
      "frame": "rgba(70, 26, 92, 1)",
      "tab_background_text": "rgba(247, 247, 247, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8f6ed559-a992-4601-9c99-2f3bf1a8b1cf}"
    }
  }
}