Examine source code of Time Cost Converter

{
  "manifest_version": 3,
  "name": "Time-Cost Converter",
  "version": "1.0.1",
  "description": "Convert dollar amounts into how many hours and minutes you need to work (with optional 30% tax).",
  "browser_specific_settings": {
    "gecko": {
      "id": "time-cost-converter@pauliespace.pw"
    }
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "icons": {
    "16": "icons/time_cost_converter.ico",
    "48": "icons/time_cost_converter.ico",
    "128": "icons/time_cost_converter.ico"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icons/time_cost_converter.ico"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "css": [
        "timeCost.css"
      ],
      "run_at": "document_idle"
    }
  ]
}