Examine source code of Transfert Free

{
  "manifest_version": 3,
  "name": "Transfert Free",
  "version": "2.1",
  "icons": {
    "48": "upload-zone.svg"
  },
  "action": {
    "default_icon": "upload-zone.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "clipboardWrite"
  ],
  "host_permissions": [
    "https://transfert.free.fr/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://transfert.free.fr/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e853aab-f12c-49ff-b888-c1a7fff13494}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}