The gray theming of the Start Center (i.e. on OS X) has made the Help and Extensions button labels (already with smaller font) even more inconspicuous. They are placed as some kind of footnotes or copyright notices to the bottom of Start Center and thus seem unclickable/nonfunctional. If these buttons are not needed, they should be removed. If one is more needed than the other (probably Help is often used?) then that one could be made into same style as other buttons - with icons. The other could be removed. If they are both needed they should have a more prominent position/form, analogue to the other buttons. This part of Start Center might need some more UIX love.
*** This bug has been marked as a duplicate of bug 91990 ***