Examine source code of Natalie OC Firefox header

{
  "theme": {
    "images": {
      "theme_frame": "NatalieFirefoxH.png"
    },
    "colors": {
      "frame": "#aba2a2",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Natalie OC Firefox header",
  "manifest_version": 2,
  "description": "My personal Firefox header, feel free to use it if you want, but please do not distribute it."
}