The messages in the journal are actually weird:
rtkit-daemon[132284]: Successfully made thread 145442 of process 145185 (/usr/lib64/firefox/firefox) owned by '1000' RT at priority 10.
rtkit-daemon[132284]: Successfully made thread 2534 of process 2507 (/usr/bin/gnome-shell) owned by '1000' RT at priority 20.
rtkit-daemon[132284]: Successfully made thread 2534 of process 2507 (/usr/bin/gnome-shell) owned by '1000' high priority at nice level 0.
rtkit-daemon[132284]: Successfully made thread 2534 of process 2507 (/usr/bin/gnome-shell) owned by '1000' RT at priority 20.
rtkit-daemon[132284]: Successfully made thread 2534 of process 2507 (/usr/bin/gnome-shell) owned by '1000' high priority at nice level 0.
It says 'made owned by'. Does user 1000 not own the process to begin
with? Which user owned it before? Or what is that supposed to mean?