Examine source code of Loan Calculator

{
  "manifest_version": 2,
  "name": "Loan Calculator",
  "version": "1.0",
  "description": "Calculate your loan monthly payments with ease.",
  "icons": {
    "48": "icons/loan-icon-48.png"
  },
  "permissions": [],
  "browser_action": {
    "default_icon": "icons/loan-icon-48.png",
    "default_popup": "popup.html",
    "default_title": "Loan Calculator"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6b86bf79-e86a-4151-aca7-f91071d2d8f8}"
    }
  }
}