Examine source code of Princesses at winter

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    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#a3d6d3",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Princesses at winter",
  "manifest_version": 2
}