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When closing with firefox while having multiple tabs that confirm dialog comes up. Theres a box that ask if you would always like to close when more then 1 tab is open. I accidentally checked that off. How do i undo that?

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up vote 3 down vote accepted


Tools > Options > Tabs > Warn me when closing multiple tabs.

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You can re enable is using about:config

  • Open a new tab with blank page and type about:config
  • Accept any security warnings and type browser.tabs.warnOnClose and make sure that its true.
  • If false, double click and make it true.

Thats it.

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I also had to set browser.showQuitWarning to true. I think this is a newer setting. – Robie Basak Jul 19 '13 at 11:35

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