Examine source code of Youtube Extra Search

{
  "manifest_version": 3,
  "name": "YouTube Extra Search",
  "version": "1.4",
  "description": "Deep grid search for YouTube results.",
  "browser_specific_settings": {
    "gecko": {
      "id": "extra-search-results@yourdomain.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png",
      "128": "icons/icon-128.png"
    },
    "default_title": "YouTube Extra Search"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs"
  ],
  "host_permissions": [
    "*://www.youtube.com/*",
    "*://youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*",
        "*://youtube.com/*",
        "*://m.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "results.html"
      ],
      "matches": [
        "*://www.youtube.com/*",
        "*://youtube.com/*",
        "*://m.youtube.com/*"
      ]
    }
  ]
}