Good stuff

[1] NASA Night Launch

• Wow!
• Not enough contrast between the black background and the lighter grey around the toolbar buttons (top picture).
• I really like the look of the tabs. The shape and the colour of the background, selected and not selected tabs and the title text. Very well done.
• There’s a cute little space shuttle picture which ought to be hacked out of the Addons list.
• The url text is very hard to read (no contrast) when loading a page. [edit: this was due to the Fission addon]

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[2] Revelation

• not too bad, but I don’t agree with the general style
• seems incomplete in places

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[3] MidnightFoxy 2.20100123

• hard to read the titles of tabs
• ugly addons list

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[4] In The Dark

• very dark, very contrasty though. I don’t like it.

Cannot install

[5] Dark Revisited

• I can’t force-install it on my 3.6 beta.. =/

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[6] PitchDark

• does nothing

Of note

I also want to give props to Classic Compact for really doing its job well. If you need your screen real-estate, this is a good theme. Also check out Classic Compact Options.

Bonii!

1. GTK themes (try lxappearance) also change Firefox.
2. If you specify a non-default theme in Firefox then that theme will override the GTK preference.
3. Some of the GTK theme bleeds through into Firefox regardless of your Firefox-theme choice. For example, Xfce-dusk is a reasonable (but imperfect) dark theme. But in Firefox when you edit a WordPress post the default text is white. The background colour stays white, so you can’t read much. =/

To fix that, you must change your theme back to something else, like ClearLooks, and reload the page in Firefox.

1. The "make site visible" Greasemonkey script can help with website colours for general surfing. What a WONDERFUL tool. I think it’s unfinished/bugged though.