Examine source code of Poplink

{
  "manifest_version": 2,
  "name": "Poplink",
  "description": "Create, share and track custom short links",
  "version": "1.0.0.1resigned1",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "96": "icons/icon96.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [],
      "js": [
        "index.js",
        "libs/postmessage.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "overlay/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1d308784-75ef-4f0c-8213-e6412d396c3b}"
    }
  }
}