Examine source code of frozenBerry

{
  "name": "frozenBerry",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "frozenberries (3).jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(165, 168, 184, 1)",
      "toolbar": "rgba(255, 255, 255, 0.64)",
      "bookmark_text": "rgba(59, 63, 87, 1)",
      "toolbar_field": "rgba(179, 14, 36, 0.49)",
      "toolbar_field_text": "rgba(59, 63, 87, 1)",
      "tab_line": "rgba(59, 63, 87, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b4c30c25-3306-4e5a-855d-5cc2a2b9877a}"
    }
  }
}