I don't see any tab, and I don't know about any add-on manager. I don't have any add-on which would do anything funny. I will check the settings on this TB. v.10 was showing Tabs below the other toolbars.
I will add to this if I see anything new. But, Tabs on top are fine. I am using Facebook RockMelt which is based on Google Chrome.
UserAgent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.7 (KHTML, like Gecko) RockMelt/0.16.91.345 Chrome/16.0.912.77 Safari/535.7
A minority may be right, and a majority is always wrong
~ Henrik Ibsen
WinXP, SP3, 512 MB, SM2.17.1, FF21, TB17.O.5, IE8.0, Google Chrome 26, Ghostwall , Kingsoft5.6, JRE1.7_21.