How to use public SOCKS4 proxy system wide?

I'm using Pop!_OS 20.04. Firefox has built-in proxy settings. So, there's no problem. I can use proxy on wget, curl, apt using proxychains. But, it's not system wide. I tried gnome-control-center (Network > Network Proxy > Manual and added proxy server and port but, didn't work at all). I also tried nmcli - nmcli con edit CONNECTION_NAME - set proxy.method auto - set proxy.pac-script proxy.pac Here's my proxy.pac function FindProxyForURL(url, host) { SOCKS4 *proxy*:*host* } But, that's also not working.