Comment 21 for bug 1983010

I can reproduce it on the following page: https://plus.rtl.de/video-tv/shows/team-wallraff-reporter-undercover-242031/2024-4-993984/episode-1-schmutz-und-gier-undercover-in-der-reinigungsbranche-973676

Click on play(German "Abspielen").

Debian Stable Gnome Wayland with enabled Mozilla APT repository. Firefox 124.0.2.

Apr 06 17:12:09 user firefox.desktop[12712]: [12712] Sandbox: attempt to open unexpected file /sys/devices/system/cpu/cpu0/cache/index2/size
Apr 06 17:12:09 user firefox.desktop[12712]: [12712] Sandbox: attempt to open unexpected file /sys/devices/system/cpu/cpu0/cache/index3/size
Apr 06 17:12:09 user firefox.desktop[12712]: [12712] Sandbox: attempt to open unexpected file /sys/devices/system/cpu/present
Apr 06 17:12:09 user firefox.desktop[12712]: [12712] Sandbox: attempt to open unexpected file /sys/devices/system/cpu/possible
Apr 06 17:12:13 user firefox.desktop[12716]: [12716] Sandbox: attempt to open unexpected file /sys/devices/system/cpu/cpu0/cache/index2/size
Apr 06 17:12:13 user firefox.desktop[12716]: [12716] Sandbox: attempt to open unexpected file /sys/devices/system/cpu/cpu0/cache/index3/size
Apr 06 17:12:13 user firefox.desktop[12716]: [12716] Sandbox: attempt to open unexpected file /sys/devices/system/cpu/present
Apr 06 17:12:13 user firefox.desktop[12716]: [12716] Sandbox: attempt to open unexpected file /sys/devices/system/cpu/possible

No entries can be seen in the journal-logs with these parameters.
MOZ_DISABLE_GMP_SANDBOX=1 firefox -p
libva info: VA-API version 1.17.0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_17
libva info: va_openDriver() returns 0
[Parent 15764, IPC I/O Parent] WARNING: waitid failed pid:16098 errno:10: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:244
[Parent 15764, IPC I/O Parent] WARNING: waitid failed pid:16091 errno:10: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:244
[Parent 15764, IPC I/O Parent] WARNING: waitid failed pid:15980 errno:10: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:244
[Parent 15764, IPC I/O Parent] WARNING: waitid failed pid:15954 errno:10: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:244