Gecko - Icons (w/ CuteMenus SVG)

if you use Firefox 3 Gecko - Icons (FF3)
Gecko - Icons2 (w/ CuteMenus SVG) (more icons)

CuteMenus Crystal SVG required (if you dont have cutemenus then use Gecko - Icons (w/o CuteMenus SVG))
uses CuteMenus Crystal SVG code/icons (https://addons.mozilla.org/firefox/addon/1330)

adds icons to buttons/some menuitems
if theres icons missing/wrong then let me know (same if you see something with lots of icons in it)

tested on Firefox 1.5.0.12, 2.0.0.16, 3.0.1 | Thunderbird 1.5.0.9, 2.0.0.6, 3.0a1 | Flock 0.9.1.3 | SeaMonkey 1.1.7, 2.0a1 | Songbird 0.2.5.1 | Sunbird 0.7 rc2 | XUL Explorer 0.7 | Prism 0.9

adds icons to these extensions (and generic icons to others)
Adblock Filterset.G Updater, Adblock Plus, Autocopy, Autofill Forms
Back to Top, Bookmark DD, British English Dictionary
Calc, Cache Status, Chatzilla, Chrome List, CLE, CookieSafe, CustomizeGoogle
Dictionarysearch, Download Statusbar, DownThemAll!
Explore Chrome
FasterFox, Favicon Picker 2, FEBE, Fetch Text URL, Firebug, FireFTP, Fission, FlashGot, Forecastfox, FormFiller, FoxMarks, Foxy Proxy, Foxytunes
Gmail Manager, Gmail Notifier, Googlebar Lite, GreaseMonkey, GSpace
HTML Validator
IE Tab, IEView Lite
JSView
keyconfig
LinkVisitor, Live HTTP Headers, LiveClick, Local Install
Menu Editor, MinimizeToTray, Multiple Tab Handler
NoScript, Nostalgy
ObPwd, Organize Search Engines, Organize Status Bar
PageShortcuts, Password Hasher, Password Exporter, PasswordMaker, PDF Download, Personal Menu, Perspectives, Public Fox
QuickNote
RDFViewer, Redirect Remover
Sage, Save Link in Folder, Secure Login, Smart Link, SmoothWheel, Show Picture, Splash!, Split Browser, StumbleUpon, StyleSheet Chooser Plus
Tab Mix Plus, TargetKiller, Titlebar Tweaks, Tweak Network
Update Notifier, Update Scanner, Unplug
View Cookies
WeatherBug, Wizz RSS
LouCypher's inspectWindow.uc.js/inspectChrome.uc.js

more icon styles:
Stylish - Menu/Button Icons
Gecko - StatusBar Icons (w/ CuteMenus)

icons and corresponding rectlist
http://choggi.googlepages.com/mosaicv1.9.7z

Updates:
this will be the last update (other then bug fixes) see Gecko - Icons2 (w/ CuteMenus SVG) for new icons
had space for one more icon
removed some comments and added a couple more icons
changed the treerow tweaks a bit
made a selector less generic
changed the launch file icon in seamonkey's download dialog box to another
changed Back to Top icon to smaller one
fixed problem with toolbarbutton spacing (thanks RabidMonkey)
a couple of changes to buttons in the options dialog
changed an icon
removed padding from ff3 back/forward

big screenshot:
http://img111.imageshack.us/my.php?image=optionsxl5.png
radio icons in screenshot from Firefox/Thunderbird - IconSets