7 links, shown 1 - 7
Links per page: 

Aaron Spuler's themes
Apollo, Atlas, iCandy Junior, Mars and others for Firefox, Thunderbird, Mozilla and Netscape.
CatThief's themes
Mostly Crystal for Firefox, Thunderbird, Mozilla Suite and SeaMonkey.
Ed Hume's themes
Aeon Clouds, Aeon Colors, Aeon, Aeon Big, Aeon Jumbo, Scribblies Brite, Scribblies Kids, Scribblies Plain, Halloween, HiVis and HiVis Large - themes for Firefox.
Sailfish's themes
Lots of Mac and Safari styled Mozilla Firefox themes, Thunderbird and K-meleon themes.
Silvermel and Charamel
Silvermel and Charamel - themes for Firefox and Thunderbird.
Switch Themes
Switch Themes allows applying different "full" themes without restarting the browser.
YATT - Yet Another Theme Tutorial
A comprehensive tutorial on creating your own Firefox theme.

7 links, shown 1 - 7
Quick jump:
Choose your site flavor:
New: The selected flavor will now be remembered!
New Icons
Lovely green eyed and round faced kitties.
Bobtails - tiny, cute and disheveled.
Anime Cats
Meet Anime Cats - weird and charming, painted luminous and crazy colors and go to the download page to grab them all.
Dog Icons
Cats, cats, cats... Hey you may say, what about dogs? Don't they deserve their own icons? Sure thing they do! Here is a few - go to the dog icons page to see the rest of the set and download.
Get Firefox!

Contact me (Red_Fat_Lazy_Cat):

Error. Page cannot be displayed. Please contact your service provider for more details. (5)