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If you have the Web Developer plugin installed try 'Information > View Color Information'

It gives only the basic info and not all the features of this plugin but it may be enough.

I refuse to download any color scheme plugin from a site that uses blue headlines on a black background.

I still can't use the eyedropper function in my Ubuntu. :( Anyone had success?

Before reading the comments I tried it too and found that it didn't work for me either.

funny.. because i just reverted to firefox 2 today because colorzilla and firebug would crash FF3 every 15 minutes.

Reverted because this is an invaluable tool...

I use it everyday. Great extension.

ColorZilla - Firefox plugin for Web Devs