Examine source code of Flash Counter Pro

{
  "manifest_version": 2,
  "name": "Flash Counter Pro",
  "version": "5.4.2",
  "description": "Suivre vos comptages sans effort. Fonctionne hors ligne.",
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f0e18123-9203-4b16-abf5-81b81946155e}",
      "strict_min_version": "128.0"
    }
  },
  "author": "Smith Creations",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png"
    }
  }
}