Whonix

Whonix is an operating system focused on anonymity, privacy and security. It's based on the Tor anonymity network, Debian GNU/Linux and security by isolation. DNS leaks are impossible, and not even malware with root privileges can find out the user's real IP. https://www.whonix.org

Use Applications over Tor with Stream Isolation and Time Privacy - for better anonymity / privacy.

AppArmor profile for HexChat IRC - https://www.kicksecure.com/wiki/AppArmor - for better security (hardening).