Examine source code of shimu-una

{
  "theme": {
    "images": {
      "theme_frame": "shimu.jpg"
    },
    "colors": {
      "frame": "#808080",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "shimu-una",
  "manifest_version": 2,
  "description": "ひとりでも多くの人に使ってほしいです。よろしくお願いいたします。"
}