[Bug 1983010]

[Gpascutto]

To correct myself: according to
https://bugzilla.mozilla.org/show_bug.cgi?id=1639531#c14 at least H264
video should now work even without installing those packages, but you do
get better performance with them installed, as ffmpeg is more optimized
than OpenH264.

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

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