Examine source code of Instagram-guest

{
  "manifest_version": 2,
  "name": "Insta-guest",
  "version": "1.5",
  "description": "Allows to browse Instagram without login.",
  "content_scripts": [
    {
      "matches": [
        "*://www.instagram.com/*"
      ],
      "js": [
        "app.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8e6822de-d72f-4284-9400-1164ee39b07d}"
    }
  }
}