Starting X gets stuck when ~/.xsession exists

I have a single-board computer (Libre Computer Le Potato) that I'm trying to use to run a wall display. I want it to automatically launch X after it boots, and start Firefox. Currently, I can get as far as starting the X server. My understanding is that now I need to make a ~/.xsession file to run Firefox, but when I do, the computer gets stuck in a loop. The the .xsession file I'm using is simple: #!/bin/bash # invoke global X session script echo hey . /etc/X11/Xsession echo heyo exec ~/autorun.sh Where autorun.sh just contains the command to start Firefox. The .xsession-errors file that is produced is made up of blocks like this: Xsession: X session started for kiosk at Sat Feb 24 20:46:13 UTC 2024 dbus-update-activation-environment: setting DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1002/bus dbus-update-activation-environment: setting DISPLAY=:0 dbus-update-activation-environment: setting XAUTHORITY=/home/kiosk/.Xauthority localuser:kiosk being added to access control list dbus-update-activation-environment: setting QT_ACCESSIBILITY=1 hey There are about four of those blocks per second. When there's no local .xsession file, x starts without issue. What's going on here?