[Bug 230102]

[Zxspectrum3579]

Since Tab Mix Plus is not working any more, is there a way to force
FireFox to ask "Are you sure you want quit FireFox" or something?

I sometimes miss my target when using mice, so I exit FireFox
accidentally, which is annoying.

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https://bugs.launchpad.net/bugs/230102

Title:
  No warning when closing multiple tabs

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