I'm using firejail to sandbox firefox. When I use `lsof -i`, there are no connections shown. Firejail does namespace isolation on the process, so i do this

`ps aux | grep firefox | awk ' { print $2} ' | while read p ; do nsenter -t $p lsof -i ; done` 

to enter each namespace and to lsof -i. I've tried `nsenter -t <pid> -n lsof -i` as well but nothing appears. But this works when I lsof as root. Shouldn't a user be able to list open socket connections?