This inspirational theme, created for the Firefox browser, is one of the most attractive themes I have seen in some time.  Designed with the idea in mind that simple/flat designs tend to be more appealing than overly decorated ones; Purity is ready to refresh your browsing experience.
The author of the theme notes that some of the theme is still a work in progress, as many of the dialog icons are from the stock Aero theme.  However I have [...]

Ready to make your Firefox browser a little more Wii-like?  WiiFox, a new theme for Firefox, is based on the highly popular video game system the Nintendo Wii.  It doesn’t really rip anything off directly, it just takes inspiration really from the Wii’s own internet browser and interface. 
If you like the theme, be sure to let the developer know.  Since it is right now an “experimental” theme, I am sure feedback would be appreciated in any way you can [...]

Light is a word of many meanings.  It could be the lightest in color or the lightest in its impact on the interface of your browser.  I have done my best to find the lightest popular Firefox 3 themes that would fit into either dictionary definition.
Whitehart – I never did use this theme until I was looking for a simple one for my Kubuntu install of Firefox on my laptop.  Haven’t looked back since!  Very sleek, light and simple.

Chromiefox – [...]

Rein, which in German means “pure”, is one of the best looking simple themes I have seen in a while.  Usually the more colorful themes catch my eye the most but this one is well worth checking into.
Here is a screenshot of this awesome monochrome flavored theme:

You could definitely say this theme was offbeat and a ‘bit different for sure.  You can pick up the Rein theme for Firefox 3 and up over at the Firefox Add-ons web site.  [...]

TwisterMC’s easy on the eyes Firefox theme is now ready for download if your using Firefox 3.  The iPox theme has always been a favorite of mine, due to it being very unique and different.  Definitely considered a classic if there ever was one.
    
You can pick it up at the Firefox Add-ons site and be sure to stop by  TwisterMC’s bug squashier if you notice any bugs or problems.