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
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