Examine source code of my_cat_milk

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#080808",
      "tab_background_text": "#333d32"
    }
  },
  "version": "2.0",
  "name": "my_cat_milk",
  "manifest_version": 2,
  "description": "我が家の猫です。\n初めて作成したので、下手ですが。。"
}