I have noticed in System Monitor that there are the 'other' programs, 'System Monitor <2> and the second Firefox. I right clicked on one and up popped a small menu with 'Show Application Window'. I selected this option and it displayed the program, 'System Monitor <2>' where I was able to see the 'other' programs.
There were duplicates of other programs too, Ksysguard,Ksysguardd, avahi-daemon, dbus-daemon, about 8 'gettys', Kworker, ksoftirqd, numerous 'kworker', lightdm, migration.
To me, that looks like 2 sets of system files...