Examine source code of FireFox Quest

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "FireFox Quest",
  "manifest_version": 2,
  "description": "The Firefox Quest is a vector image showing a sunsetting behind a forest and mountains."
}