Examine source code of YouTube Caption Search

{
  "manifest_version": 3,
  "name": "YouTube Caption Search",
  "description": "An extension for searching Caption in YouTube videos",
  "version": "2.1.5",
  "icons": {
    "16": "assets/16.png",
    "32": "assets/32.png",
    "48": "assets/48.png",
    "128": "assets/128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "js/content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "resources": [
        "js/dom-script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "dg99c1g6w@mozmail.com",
      "strict_min_version": "78.0"
    }
  }
}