Examine source code of Show/Hide Password Toggle

{
  "manifest_version": 3,
  "name": "Show/Hide Password Toggle",
  "version": "1.0",
  "description": "Add an eye icon to toggle visibility of password fields.",
  "permissions": [],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "show-password-toggle@example.com"
    }
  }
}