When I was restarting Xubuntu, the firefox was started at startup.
But when I was going to Session and Startup, firefox is not there!
And here is the ls /etc/xdg/autostart/
output :
at-spi-dbus-bus.desktop onboard-autostart.desktop
baloo_file.desktop pam_kwallet_init.desktop
blueman.desktop plasmashell.desktop
gnome-keyring-pkcs11.desktop polkit-gnome-authentication-agent-1.desktop
gnome-keyring-secrets.desktop polkit-kde-authentication-agent-1.desktop
gnome-keyring-ssh.desktop powerdevil.desktop
gnome-software-service.desktop print-applet.desktop
gsettings-data-convert.desktop pulseaudio.desktop
indicator-application.desktop update-notifier.desktop
indicator-messages.desktop user-dirs-update-gtk.desktop
indicator-sound.desktop xembedsniproxy.desktop
kdeconnectd.desktop xfce4-clipman-plugin-autostart.desktop
klipper.desktop xfce4-notes-autostart.desktop
krunner.desktop xfce4-power-manager.desktop
light-locker.desktop xfce4-volumed.desktop
nautilus-autostart.desktop xfsettingsd.desktop
nm-applet.desktop xscreensaver.desktop
nvidia-settings-autostart.desktop
Update: I was trying this command later but firefox not apeared :
cd /etc/xdg/autostart/ && sudo sed --in-place 's/NoDisplay=true/NoDisplay=false/g' *.desktop
And here is the question, how can I disable firefox from startup?
The another location that cause to startup applications is
~/.config/autostart
In that location I have firefox.desktop and after remove that file my problem was solved.