[Python] Can not established Websocket secure connection on Firefox

I am stuck with Firefox. I could not make WebSocket work on it. I use Tornado Websocket and I initialized it by code below:

app = Application([(r'/mypath/ws', WSHandler)])
http_server = HTTPServer(app, ssl_options={
"certfile": "~/certs/websocket.crt",
"keyfile": "~/certs/websocket.key"
})
http_server.listen("443")


And I initialized it on Javascript side like this:

var WS = new WebSocket("wss://websocket.localhost/mypath/ws");


This code works fine on Chrome, meanwhile, I created the cert by myself and run the page under HTTPS. But Firefox keeps saying that:

Firefox can't establish a connection to the server at wss://websocket.localhost/mypath/ws.


I google it and found too many thoughts but none of'em worked for me

Any help will be appreciated.

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