Firefox 23.0 doesn't warn me when closing multiple tabs, unless only one window is open.
I've selected the option for Firefox 23.0 to warn me before I try closing windows with multiple tabs. If only one window is open and that window has multiple tabs, I receive the warning. If more than one window is open and multiple tabs are open in any or all of them, the warning doesn't appear until I get to the final open window.
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hello, the message is only there by design if you close the whole browser with still a few tabs open in it (and also only when you choose not to store browser history). if you want to restore one of multiple windows closed during a session you can do so from the history menu or the keyboard shortcut ctrl+shift+N.
Use "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: Firefox > Quit Firefox; Linux: Firefox/File > Quit) to close Firefox and all open windows if you are currently doing that by clicking the close X on the Firefox title bar.