I'd expect those WebSocket errors accessing the main site. Also I have no idea on the status of Web Bluetooth on the Pi, but it's not guaranteed - Google's official position is 'not supported on Linux'.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
I'd expect those WebSocket errors accessing the main site. Also I have no idea on the status of Web Bluetooth on the Pi, but it's not guaranteed - Google's official position is 'not supported on Linux'.
Can you post a picture of the console when accessing http://raspberrypi.local:1888/ide from OSX or Windows?