Examine source code of Factur-X Generator-v3

{
  "manifest_version": 3,
  "name": "Factur-X Generator",
  "version": "3.0.0",
  "description": "Générateur de factures électroniques conformes EN 16931 avec numérotation séquentielle automatique. Traitement 100% local.",
  "author": "Factur-X Generator Team",
  "browser_specific_settings": {
    "gecko": {
      "id": "facturx-generator-v3@addons.mozilla.org",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_popup": "popup-v2.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "Factur-X Generator V2 - XML embarqué"
  },
  "permissions": [
    "storage",
    "downloads"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "libs/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}