Examine source code of Excel_kun

{
  "theme": {
    "images": {
      "theme_frame": "Excelheader2large.jpg"
    },
    "colors": {
      "frame": "#c4ffcb",
      "tab_background_text": "#cfffba"
    }
  },
  "version": "2.0",
  "name": "Excel_kun",
  "manifest_version": 2,
  "description": "Всем привет! Эксель здесь! ^___^\nIt's my 2-nd work))"
}