Based around the hmmXP visual style for Windows, the hmmXP theme for Firefox gives you something familiar (that sort of Windows 9x look) with just a touch of visual appeal.  The theme is compact, but doesn’t feel as if everything is squeezed in just for the sake of squeezing it in. 

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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?  [...]

Come on, you know you need something to do while killing time at the office. You know you want to play Pacman inside of your favorite orange and blue browser. Adding Firefox and Pacman together is like peanut butter and jelly. They are two great flavors that just seem to go together.
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