Examine source code of Cubic.

{
  "theme": {
    "images": {
      "theme_frame": "2-1112--asobu-qbick---1144.jpg"
    },
    "colors": {
      "frame": "#f7e1e1",
      "tab_background_text": "#f7f7f7"
    }
  },
  "version": "2.0",
  "name": "Cubic.",
  "manifest_version": 2,
  "description": "キュービックのように。。"
}