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Multiple Tabs Warning on CLOSING windows is NOT WORKING, why?

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Firefox used to warn me when multiple tabs where going to be closed (even in private browsing or without remembering history). Now it is closing the WHOLE window with multiple tabs inside. (Of course the option is checked in the preferences). So normally it should work. But it doesn't now. When i click by mistake on the X (close button) of the main window, it closes all the tabs without warning.

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Hi,

You can try to set browser.showQuitWarning in about:config to true, and also change When Firefox starts in Tools (Alt + T) > Options > General to anything other than Show my windows and tabs from last time.

about:config Entries

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