User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1

I have tabs open in firefox, more than will fit in the width of the window.
If I open a new tab, the tab bar scrolls to the right and displays the right-most
tab.  If I use the left arrow or right arrow, the tab bar shifts left and 
right, as appropriate.

If I shift all the way to the left-most tab, I cannot see the left-most tab.
If I pull down the tab-list, I can see all the tabs, and select the left-most
tab, but it does not display in the tab bar.

I had been running FF 7.0.1 prior to upgrading to openSUSE 12.1, and it did not have this problem.  

The only difference between the two instances that I can see is that FF version
from Mozilla is compiled for i686 and the FF version from openSUSE is x86_64.

Reproducible: Always