my current list:
# ENABLED EXTENSIONS: (67)
Adblock 0.5.2.039 - no need to describe this one
Add Bookmark Here 0.5.3
All-in-One Gestures 0.12.4 - mouse gesture, i use it for opening new tabs, closing and moving between them, but number of option is really big and you can customize really easy
Allow Right-Click 0.1.1
Auto Copy 0.5.3 just select text and its copied.... good for quick responses on boards
BBCode 0.3.7
Bookmark Backup 0.3.3
Bookmarks LinkChecker 0.6.8
Bookmarks Menu Button 0.2.3.2005012802
Calculator 0.7
Checky 2.5
ChromEdit 0.1.1.1
ColorZilla 0.8.2
Compact Menu 1.7.2
DictionarySearch 0.7 - i use it ti check some words before posting, dont want to look like totally illiterate
Diggler 0.9 pretty good, you can go higher in page by drop down menu next to adress bar....
Disable Targets For Downloads 0.9
Download Manager Tweak 0.6.5 - original DL manager sucks, this helps a bit
EditCSS 0.3.1
EMbuttons 1.1.3
Enhanced History Manager 0.5.1.00 search, sort by and other function for history....usefull
Ext2Abc 0.2.1
Ext2File 0.2.8
Favorites Converter (export) 1.0.1
Findbar Basics 1.01
FirefoxView 0.31.1
ForecastFox 0.7.1 gives you forecast and you can place it anywhere, easy to configure....i like it
FoxyTunes 1.1
FoxyTunes Skin - Aqua Bubbles Orange 2.0 play your media player and control it from Firefox (almost all media players supported), (there are more skins
Google Pagerank Status 0.9.3
HiddenPrefs 0.4
Html Validator (based on Tidy) 0.5.7
ieview 0.86
Image Toolbar 0.5
Launchy 3.9.0
Leech 1.5.0+
Magpie 3.1.2
miniT (drag+indicator) 0.4
New Tab Homepage 0.1
PrefButtons 0.3.2
Print It! 0.3.1
QuickNote 0.6 good one....4 quick notes, To-Do kind of thing
ReloadEvery 0.5
ScrapBook 0.12.0 - new one i found and i like it....basically if you find site and like it, you can put i there and use offline...works kinda like bookmarks
Search Button 0.4.7
SEOpen 0.4
SessionSaver .2 0.2.1.027 - couple options, but main are 1) if browser crashes, when you start it you are back where you were 2) you can set it up to always start your browsing where you clicked "quit"
Slim Extension List 0.1
Smiley Xtra 3.1.3 - hehehe....larga database of smiley, with preview and "insert forum code button".... beats B3D smiley collection so hard its not even fair to compere
Sort Bookmarks 0.6.0
SpiderZilla 1.06
SpoofStick 1.05
Statusbar Clock 1.6.4
Tab Clicking Options 0.5
Tab X 0.5a Ultra
Things They Left Out 0.1.4.2
Toolbar Enhancements 0.16.2
TripleSelect 1.5
Tweak Network 1.0
Web Developer 0.9.3
Work Offline 0.5.3
xMirror 0.1.1 adds additional extension sites...extensionmirror.nl being top one with 600+ extensions...
Zoomy 1.2
Idn Show 0.3.1
Jump Link 1.3.1
OpenBook 1.2.0
Thumbs 0.4.1
well...thats mostly it.....some i just installed didnt have time to play with them...