Examine source code of Soccer World by MaDonna

{
  "name": "Soccer World by MaDonna",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.07)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 200, 36, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e0ce3bcd-dbe2-4127-9861-1f8b8a15c1c4}"
    }
  }
}