"[HMR] Waiting for update signal from WDS..." error in React

i have v16.12.0 react-dom 16.12.0 react-scripts: 3.3.0 After I run npm start I get a message in the console "[HMR] Waiting for update signal from WDS..." The page still shows up and refreshes automatically whenever a change is made but it only works on Chrome and Mozilla. I tried

    var connection = new WebSocket(
    url.format({
    protocol: window.location.protocol === 'https:' ? 'wss' : 'ws',
    hostname: window.location.hostname,
    port: window.location.port,
    // Hardcoded in WebpackDevServer
    pathname: '/sockjs-node',
    slashes: true,
  })
);

its working but whenever i download a package I get the same error again

How can i fix that?