Examine source code of kolkata calcutta

{
  "theme": {
    "images": {
      "theme_frame": "kolkata6if.jpg"
    },
    "colors": {
      "frame": "#0a0808",
      "tab_background_text": "#080808"
    }
  },
  "version": "2.0",
  "name": "kolkata calcutta",
  "manifest_version": 2,
  "description": "kolkata,calcutta"
}