After the latest FF update to 3.6.15, I can no longer open multiple tabs. I used to have a startup home with three urls and 2 blank tabs. I could also open new tabs during a session. Now I can only get one tab showing. I've tried varation on the Tabs setting in the Options Menu. (BTW: I never noticed this before, but TOOLS shows 2 Options bars, bioth of which seem identical.) I tried going back to 3.6.14, but the problem remained and, of course, I get told there's an update available, so I again allowed 3.6.15 to install with no change.