Examine source code of norden-yt

{
  "manifest_version": 2,
  "name": "norden-yt",
  "version": "0.5resigned1",
  "description": "remove recommendations and prevent auto-play of next video on YouTube",
  "permissions": [
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "{9a94e980-d488-4e79-8131-c2e908731fa8}"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "youtube.js"
      ],
      "run_at": "document_idle"
    }
  ]
}