Ich starte Firefox per systemd:
systemd-run --user --unit=firefox-user /usr/bin/firefox
So habe ich eine Kontrolle, wieviel Ressourcen verbraucht werden:
$ systemctl --no-pager --user status firefox-user.service
● firefox-user.service - /usr/bin/firefox
Loaded: loaded (/run/user/1000/systemd/transient/firefox-user.service; transient)
Transient: yes
Active: active (running) since Fri 2022-04-29 04:46:00 CEST; 2h 37min ago
Main PID: 1460 (firefox)
Tasks: 396 (limit: 35982)
Memory: 1.0G
CPU: 11min 51.950s
CGroup: /user.slice/user-1000.slice/user@1000.service/app.slice/firefox-user.service
├─ 1460 /usr/lib/firefox/firefox