Webpack websockets error

[Lars Iffland]

I try to update a browser extension from v2 => v3. After I start my script to run it locally I get web sockets errors stating it cannot establish a connection

`WebSocket connection to 'ws://pboiicdpnbleoponcncnednhgapmcbfb/sockjs-node' failed: Error in connection establishment: net::ERR_NAME_NOT_RESOLVED`

I am running this with react and webpack and it seems the webpack dev server is failing the connection. I cannot find anything related to that and I feel lost here