Examine source code of YouTube Date Filter Pro

{
  "manifest_version": 2,
  "name": "YouTube Date Filter Pro",
  "version": "2.0.0",
  "description": "Filter YouTube searches by date and copy transcripts. Professional YouTube research tool.",
  "permissions": [
    "*://www.youtube.com/*",
    "clipboardWrite",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "filter.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_title": "YouTube Date Filter Pro"
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-date-filter-pro@mudman7",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}