Can not established Websocket secure connection on Firefox

If it's a self-signed certificate, browsers won't show the dialog to accept the certificate if it's only used in a websocket. You must first visit a normal page on the same server to see and accept the certificate warning, and then you can create the secure websocket.

If it's a self-signed certificate, browsers won't show the dialog to accept the certificate if it's only used in a websocket.
You must first visit the requested url to see and accept the certificate warning, and then you can create the secure websocket.

For example if your websocket url is:
wss://localhost:44300/OpenWebSocket
then visit:
https://localhost:44300/OpenWebSocket
and accept the certificate warning

I solved my problem via ProxyPass. I created a non-secure Websocket server with Tornado and run it on a specific port such as 3232:

app = Application([(r'/ws/', WSHandler)])
ws_server = HTTPServer(app)
ws_server.listen("3232")

Then I've written a proxypass in my Apache conf and use mod_proxy_wstunnel:

ProxyPass /ws/ ws://127.0.0.1:3232/ws/
ProxyPassReverse /ws/ ws://127.0.0.1:3232/ws/

And I create Websocket client on frontend like this:

var WS = new WebSocket("wss://websocket.localhost:81/ws/")

In this case I can create a connection on a secure connection with https and my port is 81 and my proxypass redirect any Websocket request to locally listened port 3232. It is not a exact solution mostly like a workaround. But it works fine for me.