After a complete failure of my computer's motherboard, I now have a new computer. I downloaded a copy of Firefox as before which is release 7.0.1 which tells me it is up to date. The red rectangular icon at top left marked Firefox which I was used to seeing and using is no longer there. Can you explain this and tell me how to get it back? There are also other differences in the layout compared to what I was seeing before and I have been unable to restore the same layout using the available setup options. Thank you.