Examine source code of YouTube Section Swapper

{
  "manifest_version": 2,
  "name": "YouTube Section Swapper",
  "version": "1.1",
  "description": "Swap the position of comment section with related videos on YouTube.",
  "web_accessible_resources": [
    "styles.css"
  ],
  "permissions": [
    "storage",
    "webRequest",
    "https://www.youtube.com/*",
    "https://m.youtube.com/*"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*",
        "https://m.youtube.com/*"
      ],
      "js": [
        "swapper.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6cd278ab-d118-4f0a-8211-344a2871c8c6}"
    }
  }
}