Examine source code of WordReference ITA

{
  "manifest_version": 2,
  "name": "WordReference",
  "version": "1.1resigned1",
  "description": "Cerca in WordReference",
  "icons": {
    "48": "icons/icono.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{df0b540a-fa99-4bfa-b163-bc567764b18b}"
    }
  }
}