Examine source code of A Fallen Angel

{
  "name": "Devil in Disguise",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "fallen-angel-6.png"
    },
    "colors": {
      "frame": "rgba(21, 117, 115, 0.65)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(255, 255, 255, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(92, 14, 49, 0.47)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 97, 168, 0.38)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9b35f45a-d998-4e9d-a2f0-da8f3aca863c}"
    }
  }
}