Qt4 firewall-applet is brokne at certain degree within Xfce's Notification Area.
Reverting to GTK+ firewall-applet.
For more informative applet, "Applet icon blinks" and
"Show applet also if firewalld is not running" are enabled per default.
Reloaded GTK+ firewall-applet - for the Xfce,
you can find here:
http://goo.gl/Gm4ffO
SRPMS/Extra.tar
Firewalld/firewalld-0.3.14.2-11.fc23.src.rpm
Reloaded GTK+ firewall-applet in action:
http://goo.gl/Gm4ffO
Screencast/sha-sha.webm
Thank you very much,
Elvis has left the building.