komali2 is referring to the long-standing issue in the React Native repo (#10027...

komali2 is referring to the long-standing issue in the React Native repo (#10027); see my comment for an explanation: https://news.ycombinator.com/item?id=20713612

Maybe the Chrome/Firefox DevTools don't, but the standalone React DevTools most definitely depend on WebSockets. My custom React renderer can't connect to them without shimming in a WebSockets implementation, for example.