Evil Firefox Error — “A parameter or an operation is not supported by the underlying object”

Question

I\'m trying to figure out what is going on here. I\'ve been at it for hours now and can\'t seem to get a grip on why this is happening.

I\'m making a few AJAX calls, and

Answer 1

For me, I was using WebSockets and called WebSocket.close(1001). It doesn't like my status code. Changing it to 1000 or not specifying a code (default 1005) works just fine.