Tmux: Control nested/remote session with C-a, instead of C-b

bind-key -n C-a send-prefix The local session still will be C-b.

firefox: disable webrtc

1. Go to about:config
2. Set peerconnection.enabled to false
3. Check on https://ipleak.net/

firefox socks5 through ssh proxy

ssh -ND 1080 user@proxyserver