Examine source code of Hello Bear

{
  "theme": {
    "images": {
      "theme_frame": "hello-bear-01.jpg"
    },
    "colors": {
      "frame": "#e39d64",
      "tab_background_text": "#6e3914"
    }
  },
  "version": "2.0",
  "name": "Hello Bear",
  "manifest_version": 2,
  "description": "くまさん、いつも優しく微笑んでくれてありがとう！"
}