MX3 4 problem under Linux Noté 3 sur 5 étoiles

I, i try MX3 4 under linux (kubuntu 11.10 and firefox 9.0.1)
I see that Firefox Button is now changed and in the urlbar do not appear border.
I make a screen of the problem.
Can you fix it and also restore the firefox button?

Cette critique concerne une version précédente du module (4).