To quickly find the right setting, type in the Search preference name input at the top of the page. Firefox requires you to confirm a warning dialog before allowing access.
To allow such connections, you must access the advanced configuration settings by typing about:config in the address bar. SecurityError: The operation is insecure. If you try to connect to an insecure WebSocket from a secure page in Firefox, the following error message is displayed: Fortunately, there are ways to disable this security feature in all browsers.
This could block your development until you have a secure WebSocket endpoint (wss) available. For example, browsers don't allow insecure WebSocket connections (ws) from secure websites (https). Increased security in web browsers can be a hindrance during development when all the infrastructure is not yet in place.
