Examine source code of Virtual Hosts

{
  "manifest_version": 2,
  "name": "Virtual Hosts",
  "description": "Apply a virtual hosts file for development purposes.",
  "version": "1.0",
  "applications": {
    "gecko": {
      "id": "virtual-hosts-firefox@codefreak.net"
    }
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*/",
    "<all_urls>",
    "storage"
  ],
  "browser_action": {
    "default_icon": "img/icon.png",
    "default_popup": "popup.html"
  },
  "background": {
    "persistent": true,
    "scripts": [
      "background.js"
    ]
  },
  "content_security_policy": "script-src 'self' https://ajax.googleapis.com; object-src 'self'"
}