Examine source code of My Dark Stripes

{
  "theme": {
    "images": {
      "theme_frame": "Firefoxpersona.jpg"
    },
    "colors": {
      "frame": "#e0e0e0",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "My Dark Stripes",
  "manifest_version": 2,
  "description": "Simple dark blue wallpeper image."
}