Examine source code of Elephant eye

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Elephant eye",
  "manifest_version": 2,
  "description": "A nice elephant eye closeup. See also <a href=\"https://outgoing.mozilla.org/a/b/javascript%3Aalert%281%29\" rel=\"nofollow\">here</a>."
}