Examine source code of YouTube Phrase Blocker

{
  "manifest_version": 2,
  "name": "YouTube Phrase Blocker",
  "version": "1.0",
  "description": "Blokuje wyszukiwanie i odtwarzanie filmów zawierających wybrane frazy.",
  "permissions": [
    "tabs",
    "https://www.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1f5c0866-5d24-4bab-b55a-a66c19ffaff5}"
    }
  }
}