I'm currently trying to accomplish two things with firejail's netfilter flag but my skill with iptables is limited.
My qbittorrent app doesn't work when netfilter is enabled. The application opens, I'm able to add new torrent trackers but files don't actually start downloading, as if there's no internet access. Even if I remove "netfilter" from the qbittorrent.profile, downloads don't start. Not sure what could be causing this or how to debug.
Some applications (e.g. Geary, Gradio, Plex) don't have built-in support for proxy configurations. Is it possible to use --netfilter to forward sandboxed traffic to a proxy port like 127.0.0.1:9050? And if so, how?
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