Examine source code of kadix Webdesigner

{
  "theme": {
    "images": {
      "theme_frame": "kadix-persona.jpg"
    },
    "colors": {
      "frame": "#660000",
      "tab_background_text": "#cc0000"
    }
  },
  "version": "2.0",
  "name": "kadix Webdesigner",
  "manifest_version": 2,
  "description": "encourage the use of open source software"
}