Examine source code of Niconico VOM Player

{
  "applications": {
    "gecko": {
      "id": "esopawry@yahoo.co.jp"
    }
  },
  "name": "Niconico VOM Player",
  "manifest_version": 2,
  "version": "0.9resigned1",
  "description": "ニコニコ動画をアカウントなしで視聴できるようにします。",
  "content_scripts": [
    {
      "matches": [
        "http://www.nicovideo.jp/watch/*"
      ],
      "css": [
        "nico.css"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "http://*.nicovideo.jp/*"
  ]
}