Examine source code of Decorating the Tree

{
  "name": "Decorating the Tree",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "DecoratingtheTreeH.jpg"
    },
    "colors": {
      "frame": "#f5e0ba",
      "tab_background_text": "#030303",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(207, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d2849bf1-b4f0-466d-93d3-aeb147d6b3b9}"
    }
  }
}