Examine source code of Form Filler test

{
  "manifest_version": 2,
  "name": "Form Filler Pro",
  "version": "1.0",
  "description": "Rellena formularios con datos de prueba con un solo clic.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{02bf23e7-ef3c-4e17-bd51-b4ec227c6084}"
    }
  }
}