I am going to redo the firefox logo on the computer. I was looking some things up and here are a link I found for the logo itself....
Best Logos Blog (in fact this site has a lot of logos for who may be interested)
here are a few given:
With this one I was having problems attaching all sections to make the whole into a 3D. This is the reason only the back circle is done and the top layer is flat, I'm sorry.