Small white square appears after using "Preferences" under the Apple sign. It is on top of approx 3 app tabs which cannot be used.
Using Mac version of FF ver 4. A small white rectangle appears under the Apple sign covering 3 app tabs after selecting and using Preferences. The rectangle is on top of the tabs so the tabs cannot be selected.
Using Mac version of FF ver 4. A small white rectangle appears under the Apple sign covering 3 app tabs after selecting and using Preferences. The rectangle is on top of the tabs so the tabs cannot be selected.