metamask-extension/app/scripts/use-snow.js

// eslint-disable-next-line import/unambiguous
(function () {
  const log = console.log.bind(console);
  const msg = 'SNOW INTERCEPTED NEW WINDOW CREATION IN METAMASK APP: ';
  window.top.SNOW((win) => {
    log(msg, win, win?.frameElement);
  });
})();