Examine source code of FillField

{
  "manifest_version": 2,
  "name": "FillField",
  "version": "1.9",
  "author": "Ferrán García",
  "description": "Gestión avanzada de perfiles y textos para rellenar campos de formulario.",
  "browser_specific_settings": {
    "gecko": {
      "id": "fillfield@ferrya1.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "basis": "consent",
        "future_versions": false
      }
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "contextMenus",
    "storage",
    "activeTab",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  }
}