Examine source code of Instagram Chat

{
  "manifest_version": 2,
  "name": "Instagram Chat",
  "version": "1.0.0",
  "description": "Enables instagram chat for the desktop.",
  "icons": {
    "48": "icons/chat-48.gif"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.instagram.com/*"
      ],
      "exclude_globs": [
        "*://*.instagram.com/direct/*"
      ],
      "js": [
        "instagram-chat.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "agent-switcher.js"
    ]
  }
}