[Bug 1983010]

[Gpascutto]

jld, you said you had a patch for the warnings, and this is getting a
lot of dupes, so I'm increasing severity/priority.

This will be just about stopping the warnings which are confusing
people: it's basically some video decoder external to Firefox poking
around to know the exact CPU configuration in the machine, which we
block, but it's essentially harmless.

If you have an actual issue with video decoding, please file a separate
bug.

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Title:
  Sandbox: attempt to open unexpected file
  /sys/devices/system/cpu/cpu0/cache/index2/size

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