Examine source code of Coinbase crypto base

{
  "manifest_version": 2,
  "version": "0.0.2",
  "short_name": "Coinbase Crypto Base",
  "name": "Coinbase",
  "description": "Alerts and comparisons for popular cryptocurrencies.",
  "browser_action": {
    "default_title": "CryptoBase",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentScript.bundle.js"
      ]
    }
  ],
  "icons": {
    "16": "img/icon-16.png",
    "32": "img/icon-32.png",
    "48": "img/icon-48.png",
    "128": "img/icon-128.png"
  },
  "permissions": [
    "alarms",
    "notifications"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{7b0c4908-3c9b-4b5b-bb5f-e59f79d58b6e}"
    }
  }
}