Examine source code of Leboncoin scraper

{
  "manifest_version": 2,
  "name": "Leboncoin scraper",
  "version": "1.0.2",
  "description": "Extension qui récupère des données du DOM et les enregistre dans un fichier JSON",
  "icons": {
    "256": "icons/icon.png"
  },
  "permissions": [
    "activeTab",
    "downloads",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3f8bc7ef-0966-49df-af5c-8a82b3b620a6}"
    }
  }
}