Examine source code of w3linux-green

{
  "theme": {
    "images": {
      "theme_frame": "firefox-bar.jpg"
    },
    "colors": {
      "frame": "#474747",
      "tab_background_text": "#a2d64d"
    }
  },
  "version": "2.0",
  "name": "w3linux-green",
  "manifest_version": 2,
  "description": "Green persona"
}