Examine source code of Onglets inactifs

{
  "manifest_version": 2,
  "name": "Gestionnaire d'onglets inactifs",
  "version": "1.0",
  "description": "Supprime les onglets inactifs depuis plus de 24h, et ferme le dernier actif si plus de 16 onglets sont ouverts.",
  "permissions": [
    "tabs",
    "storage",
    "alarms"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{533dcc6d-967b-4b7e-b0bc-b35948ea93a6}"
    }
  }
}