Examine source code of Ffoxlight

{
  "theme": {
    "images": {
      "theme_frame": "ffox.jpg"
    },
    "colors": {
      "frame": "#4f4f4f",
      "tab_background_text": "#c7c7c7"
    }
  },
  "version": "2.0",
  "name": "Ffoxlight",
  "manifest_version": 2,
  "description": "What you get finished in couple of minutes, Ffoxlight!"
}