Mike, we are using /proc/self/exe to substitute the executable with a
newer version. We can stop using it, but it was the most secure way to
get the path for the executable (see https://mxr.mozilla.org/mozilla-
central/source/xpcom/build/BinaryPath.h#83 for the other opportunity).

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https://bugs.launchpad.net/bugs/1007089

Title:
  overlayfs alters /proc/self/exe link(s), making result a dead link.

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