Examine source code of Instagram save images

{
  "manifest_version": 2,
  "name": "Instagram",
  "version": "1.4.4",
  "description": "Permite hacer cosas en Instagram",
  "icons": {
    "48": "icons/dfa85bb1fd63.png"
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "css": [
        "styles.css"
      ],
      "matches": [
        "https://www.instagram.com/*"
      ],
      "js": [
        "jquery-3.3.1.js",
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8bbf3af7-e6a8-40f9-8eed-e26a29faaccb}"
    }
  }
}