[Bug 583797]

[Liquido2]

Thanks a lot for fixing this at last!

I am gladly verifying that this is implemented in latest Nightly 65 on
Linux (x86_64)

Build ID 	20181205102000
User Agent 	Mozilla/5.0 (X11; Linux x86_64; rv:65.0) Gecko/20100101 Firefox/65.0

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https://bugs.launchpad.net/bugs/583797

Title:
  "Warn on closing with multiple tabs open" not honored

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