Examine source code of Firefox Logo Eye

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#d6d6d6"
    }
  },
  "version": "2.0",
  "name": "Firefox Logo Eye",
  "manifest_version": 2,
  "description": "AN eye looking through a broke window with Firefox logo as the iris in the eye."
}