Examine source code of Lego Halo

{
  "theme": {
    "images": {
      "theme_frame": "LegoHaloFirefoxPersona.JPG"
    },
    "colors": {
      "frame": "#335fe6",
      "tab_background_text": "#423e3e"
    }
  },
  "version": "2.0",
  "name": "Lego Halo",
  "manifest_version": 2,
  "description": "For all fans of Lego who want a new snazzy Lego theme.\n\n(If these are your images, sorry to have used them. I found all these images on Google Images.)"
}