The way to use firefox to make a tunnel to remote communication. For I/O of payloads uses cookie.sqlite and html with javascript to auto submit, the browser runs in hidden mode.
Read the docs:
firefox_tunnel_paper.pdf
Step by step to run the PoC:
Beamer_Keynote_looking_style.pdf
Demo:
More info: https://medium.com/code-fighters/firefox-tunnel-to-bypass-any-firewall-bc6f8b432980