Empty tabs appear at startup

In Firefox 14, when I run Firefox, two tabs appear: the home page and a blank tab which can never close (even if I navigate to a different page in this tab, I can never shut it down). My homepage settings are defined on do not show two tabs of the home page.
Now that I've upgraded to Firefox 15, now Firefox reveals TWO tabs virgins - no home page - only the second is always uncloseable.

I have two profiles, protected by a master password and the other not. These problems manifest themselves only in my profile protected by password; the other profile works perfectly.

I coped with a workaround: after the first window opens, I open a new window, which works perfectly, and then close the original. But I prefer not having to deal with a workaround. Could someone please help?

I have not had the opportunity to try one of your corrections, but with the upgrade to 15.0.1, I did not have this problem more. Thanks anyway for your help.

Tags: Firefox

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