Examine source code of Simpleedirect

{
  "manifest_version": 3,
  "name": "Simple Redirect",
  "version": "1.0",
  "description": "Redirects a specific site (facebook.com) to example.com. Edit redirect.js to change sites.",
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "redirect.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "simple-redirect@example.com"
    }
  }
}