MicroFox for Firefox 1.8.42

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This is the smallest theme that support both FF2.0 and FF3.0

Firefox for Linux
A fast, full-featured Web browser that makes browsing more efficient.
Firefox
The award-winning Web browser is now faster, more secure.
Firefox for Mac
Firefox 3.5 is the fastest and most advanced Firefox ever.
Mozilla Firefox is a fast, full-featured Web browser
LittleMonkey for SeaMonkey
Child of the marriage of LittleMozilla and Nautipolis
Nautipolis for Thunderbird
support for Lightning 0.8 (and Provider for Google Calendar version 0.4).
Littlebird for Thunderbird
Littlebird for Thunderbird, based on icons from art.gnome.org.
MicroThunderbird for Thunderbird
This is based on LittleFox, sporting the same screensaving
W3v8 for Firefox
W3V8, based on the IBM Intranet style (W3 v8.0) and Nautipolis
Walnut for Thunderbird
Walnut for Thunderbird 2.0 and 3.0, based on icons from art.gnome.org
Bricks
Bricks for Firefox, theme optimized for using your own background.
Metal for Firefox
inspector, downloadstatusbar, downloadmgr, calendar, quicknote, offline
Littlefox for Firefox
Designed to be a clean, simple and consequent UI for Firefox.
MicroFox for Firefox
This is the smallest theme that support both FF2.0 and FF3.0
Walnut for Firefox
Walnut is based on icons from art.gnome.org
Nautipolis for Firefox
personas, stumbleupon, chatzilla, downloadmanager, TabMixPlus