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When I close Firefox before shutting down, I close every tab. However, when I restart my computer, it says I didn't close the last few tabs.

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I close everything before I shut down, but Firefox always comes back with a message that I did not close the last couple tabs. How can I fix this?

I close everything before I shut down, but Firefox always comes back with a message that I did not close the last couple tabs. How can I fix this?

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Actually, there's a bug in Firefox 20 where if you close all the pages before you Quit, it thinks the browser crashed. As a workaround, Quit with at least one page open. Does that work for you? This should be fixed in a future release.