QUOTE(roth377 @ Jan 25 2005, 10:07)
If you have the .jar file, then you can just click tools->themes.
That should open up a small window with some themes listed. Drag your .jar file onto this window and it will install.
to use it, you will need to click 'Use Theme' and it will then instruct you to restart Firefox for the changes to take place.
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This works fine for me. I've got the ICandy theme running fine by doing it this way.