Examine source code of Winter Babies by MaDonna

{
  "name": "Winter Babies by MaDonna",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(174, 202, 209, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(174, 201, 209, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(174, 201, 209, 0.12)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(5, 5, 5, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d6ce8844-6850-447f-aa61-93f9c4ed66e0}"
    }
  }
}