Examine source code of CryptoCount

{
  "manifest_version": 2,
  "name": "CryptoCount",
  "description": "CryptoCount tells you the current price of top cryptocurrencies",
  "version": "1.0.0",
  "icons": {
    "128": "favicon.png"
  },
  "browser_action": {
    "default_icon": "favicon.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fae8780b-6fd9-49ef-96aa-aab6f8ffccd3}"
    }
  }
}