My t-bird opens a duplicate window when starting program. why? Help?

I open my t-bird program and two windows open up. Running v 24.6 on window 8.1 Help?

All other programs on taskbar open on single click. I did the start run t-bird and it opened only the 1 window. I went back to taskbar and now it opens only the one window. Weird. Hopefully when I reboot my pc the problem is fixed. thanks

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