Here is a retro theme for you, make Firefox go back in time to the Netscape era:

Foxscape is a full featured retro theme for Firefox based on Netscape Communicator 4.8 on Windows.  To be honest, I never did use the old Netscape very much.  Never did like the look of it.  You know what?  Now I can not like the look of it again!

I am sure this theme will tug on the classic heart strings of somebody out [...]