*** This bug is a duplicate of bug 1714518 ***
I can confirm the exact same behavior is also present on Linux Mint
Cinnamon 17.3 to 18.3 (currently at Firefox version 58.0) and it has
been like this for at least the last 1 and a half years.
The workaround described on comment #4 works perfectly but cannot be
considered proper default behavior.
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Firefox 46 is missing network shares in file selector
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