Examine source code of NPV Calculator Card Basic

{
  "manifest_version": 2,
  "name": "NPV Calculator Card Basic",
  "version": "1.0",
  "description": "A Net Present Value (NPV) Calculator is a web-based tool that helps users calculate the net present value of an investment",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/npv-logo.png"
    }
  },
  "icons": {
    "128": "images/npv-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fd1bcb8d-e737-4f7b-bb1e-3a8536611f98}"
    }
  }
}