Error: crbug/1173575, non-JS module files deprecated

Hi, I 'm novice and started with a sample about SPA authentication with React. But the first request after setting up “LoginButton” results with error about:
in Firefox:
crbug/1173575, non-JS module files deprecated.
in Chrome:
The extension “React Developer Tools” is not allowed to access about:neterror?e=dnsNotFound&u=https%3A//undefined/authorize%3Fredirect_uri%3Dh

Maybe somebody knows how to fix this issue?