Examine source code of Winter Owl by M♥Donna

{
  "name": "Winter Owl by M♥Donna",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Winter OwlT.jpg"
    },
    "colors": {
      "frame": "rgba(177, 178, 179, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(179, 180, 181, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(179, 180, 181, 0.1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(107, 93, 81, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8d1693ec-bf62-46c8-8910-6eb5366e4887}"
    }
  }
}