Examine source code of User Scripts Manager

{
  "manifest_version": 3,
  "name": "User Scripts Manager",
  "version": "1.1.2",
  "permissions": [
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "optional_permissions": [
    "userScripts"
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@user-scripts-manager",
      "strict_min_version": "150.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}