[Bug 78435]

[Buildtherobots]

This bug is still a problem with latest firefox (70.0.1) on windows
(32bit) and linux (amd64).

This is extremely annoying as it means opening a tar.gz file in (for
example) archive manager on linux fails every time other than the first
time you click it. This does not seem time limited, my
`/tmp/mozilla_user0` folder has mis-renamed files from yesterday.

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https://bugs.launchpad.net/bugs/78435

Title:
  temporary filenames should handle multiple extensions (.tar.gz)

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