Examine source code of Bright tiles. .

{
  "theme": {
    "images": {
      "theme_frame": "1215-tamagoiro-100p-l2.jpg"
    },
    "colors": {
      "frame": "#e8dcdc",
      "tab_background_text": "#fcfcfc"
    }
  },
  "version": "2.0",
  "name": "Bright tiles. .",
  "manifest_version": 2,
  "description": "明るいタイル。。\n\n\n\n\n1215-tamagoiro-100p-l2"
}