Comment 26 for bug 1983010

Same issue. Firefox 129.0.1 Ubuntu 24.04
firefox.desktop[1910918]: [1910918] Sandbox: attempt to open unexpected file /sys/devices/system/cpu/cpu0/cache/index2/size
firefox.desktop[1910918]: [1910918] Sandbox: attempt to open unexpected file /sys/devices/system/cpu/cpu0/cache/index3/size
firefox.desktop[1910918]: [1910918] Sandbox: attempt to open unexpected file /sys/devices/system/cpu/present
firefox.desktop[1910918]: [1910918] Sandbox: attempt to open unexpected file /sys/devices/system/cpu
firefox.desktop[1910918]: [1910918] Sandbox: attempt to open unexpected file /sys/devices/system/cpu/possible
firefox.desktop[1910918]: [1910918] Sandbox: attempt to open unexpected file /sys/devices/system/cpu/cpu0/topology/core_cpus
firefox.desktop[1910918]: [1910918] Sandbox: attempt to open unexpected file /sys/devices/system/cpu/cpu0/topology/thread_siblings
firefox.desktop[1897583]: [Parent 1897583, IPC I/O Parent] WARNING: process 1899313 is a zombie: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:245
firefox.desktop[1897583]: [Parent 1897583, IPC I/O Parent] WARNING: process 1899879 is a zombie: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:245
firefox.desktop[1897583]: [Parent 1897583, IPC I/O Parent] WARNING: process 1905217 is a zombie: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:245
firefox.desktop[1897583]: [Parent 1897583, IPC I/O Parent] WARNING: process 1899310 is a zombie: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:245
firefox.desktop[1897583]: [Parent 1897583, IPC I/O Parent] WARNING: process 1898347 is a zombie: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:245