Firefox problem webpack dev server hot restart Firefox cannot establish connection with server / websocket

Question

I have a fairly simple decision-making application that uses the webpack dev server with a hot restart.

It works fine in Chrome, Safari, Opera, but it doesn’t work at all in Firefox. with error message:

Firefox cannot establish a server connection in the ws: // localhost: 5050 / sockjs- node / 044 / 0lchvqev / websockert directory

This is very strange and difficult to debug as it tries to reload the page and just gives an error message