Examine source code of Some days visited

{
  "theme": {
    "images": {
      "theme_frame": "0122-mozadd-oooooo-kiriwaku-eusyoohntn.jpg"
    },
    "colors": {
      "frame": "#c9edf2",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Some days visited",
  "manifest_version": 2,
  "description": "0122-mozadd-oooooo-kiriwaku-eusyoohntn\n0122futta-moza-kiriwaku-eusyoohntn-syoo\n幾日かが訪れた"
}