Examine source code of Grabowl — Downloader for Instagram

{
  "manifest_version": 3,
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "version": "1.0.1",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "default_locale": "en",
  "author": "ncataman",
  "homepage_url": "https://ncataman.github.io/grabowl",
  "permissions": [
    "downloads",
    "storage"
  ],
  "host_permissions": [
    "*://www.instagram.com/*",
    "*://i.instagram.com/*",
    "*://*.cdninstagram.com/*",
    "*://*.fbcdn.net/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "grabowl@ncataman.com",
      "strict_min_version": "121.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Grabowl",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": false,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.instagram.com/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/content.js"
      ]
    },
    {
      "matches": [
        "*://www.instagram.com/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/interceptor.js"
      ],
      "world": "MAIN"
    }
  ]
}