Firefox can't establish a connection to the hookup server

[bfil]

Very simple scenario:

• A web page running on http://localhost:9000/
• An hookup server running on ws://localhost:8125/

On latest Chrome, Safari, iPhone and Nexus 4 (Chrome) the connection from the webpage to the websocket can be established correctly.

Firefox (v24) cannot connect to the websocket, these are the errors logged:

NetworkError: 404 Not Found - http://localhost:8125/
Firefox can't establish a connection to the server at ws://localhost:8125/