https://forums.whonix.org/t/apparmor-foxyproxy
FoxyProxy works fine with Tor Browser 7.0a2 hardened, but the AppArmor message appears as follows:
apparmor="DENIED" operation="open" profile="/home/**/tor-browser*/Browser/firefox" name="/run/user/1000/dconf/user" pid=XXXX comm="firefox" requested_mask="rwc" denied_mask="rwc" fsuid=1000 ouid=1000