Examine source code of Light blue set. .

{
  "theme": {
    "images": {
      "theme_frame": "e0331-isikirakira-mizuiro.jpg"
    },
    "colors": {
      "frame": "#b7ddeb",
      "tab_background_text": "#414ee0"
    }
  },
  "version": "2.0",
  "name": "Light blue set. .",
  "manifest_version": 2,
  "description": "ライトブルーセット。。\n\n\n\ne0331-isikirakira-mizuiro●"
}