Ubuntu 13.04. If I try to connect Facebook from online accounts (I mean the option in Ubuntu general settings), I see a small browser window with title signon-ui appearing, but remaining empty. Then, a browser tab appears, with address https://www.facebook.com/connect/blank.html#_=_" and content Success followed by a string, something like: (I'm translating here, actual message is localized in my language).

Security advice. Take this URL as if it would be a password and do not share it with anyone.

Annoying problem is that such tab is keep appearing randomly. How can I fix it? If not possible, is there's a setting to disable online accounts?