Examine source code of Instagram PFP Viewer

{
  "manifest_version": 3,
  "name": "Instagram PFP Viewer",
  "version": "1.1",
  "description": "View full-size profile pictures right inside Instagram, in-page and in one click.",
  "permissions": [
    "cookies",
    "downloads"
  ],
  "host_permissions": [
    "*://*.instagram.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.instagram.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "instagram-pfp-viewer@seckinaktunc.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}