Examine source code of Flutter Dragon

{
  "name": "Flutter Dragon",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Flutter Dragon.png"
    },
    "colors": {
      "frame": "rgba(50, 69, 84, 1)",
      "tab_background_text": "rgba(188, 220, 243, 1)",
      "toolbar": "rgba(52, 71, 87, 0)",
      "bookmark_text": "rgba(219, 146, 222, 1)",
      "toolbar_field": "rgba(52, 71, 87, 0)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9fec5bf4-a24e-4314-a871-62c04bdb55ed}"
    }
  }
}