There are quite a few that I use so heads up...
Here are the addons I use:
Adblock Plus 1.1.1
AutoPager 0.5.2.2
Clear Private Data... + 0.2.3
CoLT 2.4.4
Custom Download Manager 2.1b90630
Download Statusbar 0.9.6.5
Fasterfox Lite 3.8.1Lite
Fierr 0.7.1
FireDownload 1.1.7
Fission 1.0.9
Greasefire 1.0.4
Greasemonkey 0.8.20090123.1
IE Tab 1.5.20090525
InfoLister 0.10.1
Linkification 1.3.6
Menu Editor 1.2.6
MultirowBookmarksToolbar 3.8
Nightly Tester Tools 2.0.2
Organize Status Bar 0.6.3
Password Exporter 1.2
Personal Menu 4.2.0
RDown - Rapidshare Downloader 0.5.9
Rehost Image 1.3.2
Secure Login 0.9.3
SkipScreen 0.1.07102009
Smart Bookmarks Bar 1.4.3
Stylish 1.0.5
Test Pilot 0.1.2
Toolbar Buttons 0.6.0.5
Tweak Network 1.3
WebMail Notifier 1.4.3
Xmarks 3.3.2
Here are the Greasemonkey Scripts I use:
Red Filter
Download Songs From Project Playlist
Isohunt Download Linker
Torrent Crosslink - Demonoid/Isohunt
Google Image Relinker Mod
Gmail Favicon Alerts 3
The Cavern Links Checker
Here are the Userstyles I use:
about
:blank OnFire
Ad Blocking FiltersetP
Bright Focus (for buttons, links, and textboxes)
Check marking visited links (with custom color)
Cursor indicator
DeviantArt v6.2 > Streetlight Blue *Aug 09*
Facebook Dark-N-Grey 4.0 (05/08/09)
Filehippo-Wide Load
FileHippo.com - adblocked & tweaked
Firefox 3 - Tab Tweaks
FTP:// and FILE:// - beautifier ("were awfull" 2)
Google - Remove Text Ads and Sponsored Links
Google Reader - My Tweaks
Google result number
Google Web Search - Dark Gray Theme (vC)
Google: no ads and compact
Improved Softpedia.com [CLEANER & STYLEFIX]
isohunt.com - different look
Italicize unread tabs
MajorGeeks Cleanup
MBlue Combine Home-Button Vista
MBlue Combine Nav-Buttons Vista
MBlue Combine Throbber-Url-Bar
MBlue Nav-Buttons Vista on XP
MBlue Nav-Style Awesome-Bar Vista
MBlue Nav-Style Buttons Vista
MBlue Nav-Style Menubar Vista
MBlue Nav-Style Popup Vista
MBlue Nav-Style Sidebar Vista
MBlue Nav-Style Sidebar Vista (Addons)
MBlue Nav-Style Statusbar Vista
MBlue Nav-Style Tabs Vista - Inverted
MBlue Nav-Style Throbber Vista
MBlue Nav-Style Url-Bar Vista
MBlue Nav-Toolbox BG Setup - Firefox Logo Ice
mediafire cleared+centered
Modern-Wiki
MySpace - Updated Home Rearranged
Myspace.com - Remove ALL adverts - every page
New Facebook' - Remove Ads
New* Google Reader (12/05/08) Tweaks
Tooltip Colour Fixer
Userscripts.org - Dark Carbon Theme
Userstyles.org - Dark Shiny Blue, transparency
Website: cleaner - DeviantART V6
YouTube - Dark Carbon Theme
YouTube+
I do not use any themes. Userstyles make my browser looks like
this.