Examine source code of Nice graphic

{
  "theme": {
    "images": {
      "theme_frame": "Header6.jpg"
    },
    "colors": {
      "frame": "#8f8989",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Nice graphic",
  "manifest_version": 2,
  "description": "I share for my Firefox fans....\nI lve to create graphic..like this..."
}