firefox themes I like

Gradient iCool
https://addons.mozilla.org/en-US/firefox/addon/7403

ACE Safari
https://addons.mozilla.org/en-US/firefox/addon/6124

Aero Fox black
https://addons.mozilla.org/en-US/firefox/addon/6070

Heaven Cube
https://addons.mozilla.org/en-US/firefox/addon/8218

IFox Smarsgard
https://addons.mozilla.org/en-US/firefox/addon/3729

MyFireFox 2.o
https://addons.mozilla.org/en-US/firefox/addon/4129
Has links to other mods that are worth checking out

PitchDark
https://addons.mozilla.org/en-US/firefox/addon/1529

RedShift
https://addons.mozilla.org/en-US/firefox/addon/4521