OS: MacOS 10.14.6 Firefox: nightly 75.0a1(20200211215452) When I enabled socks proxy as system proxy and set firefox network settings to "use system proxy settings", A website like github using websocket can't establish connections and output these log. And there is the log from about:networking. I saw something about socks4:127.0.0.1:1086, that is my socks proxy host, but mine is socks5. I tried to set firefox network settings to manual proxy configuration and specified socks proxy to a correct version, then websockets work. I think that might be the problem. Could I continue to use system proxy settings and change the default socks version?