Examine source code of KPN Webstudio

{
  "theme": {
    "images": {
      "theme_frame": "FireFox_KPN_Personas_3000x200_v3.png"
    },
    "colors": {
      "frame": "#d6d6d6",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "KPN Webstudio",
  "manifest_version": 2,
  "description": "KPN Webstudio Personas"
}