Examine source code of Premium Autumn Collection

{
  "name": "Premium Autumn Collection",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Collection.png"
    },
    "colors": {
      "frame": "rgba(55, 32, 18, 0.65)",
      "tab_background_text": "rgba(255, 245, 225, 1)",
      "toolbar": "rgba(45, 28, 18, 0.92)",
      "bookmark_text": "rgba(255, 240, 215, 1)",
      "toolbar_field": "rgba(255, 248, 235, 0.96)",
      "toolbar_field_text": "rgba(55, 35, 20, 1)",
      "tab_line": "rgba(230, 115, 35, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d3c44c0d-d622-444b-8f05-b518f8f137c8}"
    }
  }
}