Examine source code of Instagram Follower

{
  "name": "Instagram Follower",
  "manifest_version": 2,
  "version": "1.0",
  "description": "A very simple extension to just follow any id that opens up on Instagram!",
  "permissions": [
    "*://*.instagram.com/*",
    "tabs"
  ],
  "icons": {
    "16": "/assets/favicon_io/favicon-16x16.png",
    "32": "/assets/favicon_io/favicon-32x32.png",
    "192": "/assets/favicon_io/android-chrome-192x192.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.instagram.com/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "/assets/favicon_io/favicon-16x16.png",
    "default_title": "Insta Followers",
    "default_popup": "option.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d66fd79d-ff31-4a8e-93fb-978e1b6413e6}"
    }
  }
}