Examine source code of autoClick3

{
  "manifest_version": 3,
  "name": "autoClick",
  "version": "3.1",
  "description": "Adds a red border to all webpages matching mozilla.org.",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "autoClick.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "autoClick3@example.com"
    }
  }
}