Ok, your soul isn't that dark, but with Halloween coming up, now's a fine time to dress up your copy of Firefox. Last weekend we posted a link to seven dark Firefox themes, and the comments blew up with cheers, jeers (ok, mostly jeers) and better alternatives. So, our Firefox-loving new intern Asian Angel went ahead and rounded up the best of the best from your suggestions in that comment thread. Save your eyes from glare and darken your Firefox install with one of these sleek themes.
Unless otherwise noted, to install a theme, click on the "Add to Firefox" button and restart your browser. The themes look different on the Mac than on Windows; all screenshots from Windows Vista.
The #1 theme recommended in the comments was:
NASA Night Launch

Version 0.6.20081008 by mcdavis941
Asian Angel says, "The throbber on this theme is unreal (VERY cool)!"

Some more for your consideration and viewing pleasure:
Abstract Zune

Version 3.0.1 by Bodizzle

Aero Fox

Version 3.0.2 by Bodizzle

Aquatint Black Gloss

Version 3.0.2 by Bodizzle

HEAVEN.CUBE

Version 1.42 by h3j4

Noia 2.0 (eXtreme)

Version 3.52 by Kasteo
Asian Angel notes: This one gives you options for color choice. To go with the dark version, you have to make an about:config tweak. Set signed.applets.codebase_principal_support to true, then after restart, right-click on the theme in the addons window and select "About" in order to change to Dark Noia Theme (you will be asked to approve changes), then restart again to activate dark theme.

OldFactory Black

Version 3.3 by Alexander Brandl

zblack

Version 0.4.1 by zirtoc

LightStyles

Version 0.25 by dkgo
(Note: this theme is still in experimental status, requires a free Mozilla account to log in and install.)

Stylish User style: Firefox 3 - Vista Theme (All Black)

Note: This user style requires the Stylish extension to work. (For more on using Stylish to do more than theme Firefox, see our roundup of functional Firefox user styles.)

Honorable Mention

This one's not dark, but it's still pretty good-looking.
Glasser
Version 1.0.16 by 6XGate
(Note: this theme is still in experimental status, requires a free Mozilla account to log in and install.)

To uninstall a theme, in Firefox's Add-ons dialog, in the Themes tab, choose the default and hit the "Use theme" button.
What's your favorite Firefox theme? Give it up in the comments.

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