Так, создаю. Заодно и проголосую:

AdBlock Plus
Scrapbook
NoSquint
AutoCopy
Copy Plain Text
GMail Manager
Brief
NoScript
MR Tech's Local Install
Dictionary Switcher

AdBlock Plus
Scrapbook
Secure Login
Web Developer
Forum.mozilla-russia.org :)
JSview
RSS Ticker
Image Zoom
CuteMenus - Cristal SVG
Fast Dial

AdBlock Plus
Fox2Chm
NoScript
AdBlock Element Hiding Helper
IE Tab
ChatZilla
Sage
WmlBrowser

AdBlock Plus
Scrapbook
NoSquint
Roboform Toolbar
Column Bookmarks
FoxyTunes
Linkification
TabMixPlus

added: еще All-in-Onу Sidebar

Scrapbook
ImgLikeOpera
TabMixPlus
WorkOffline
Linkification
All-in-One-Sidebar
AutoCopy
BBCode
FlashBlock
AdblockPlus

ScrapBook
Firebug
Bookmarks Backup
TabSidebar
These Toolbars with Small Icon
Toolbar Grippies
Bookmark Duplicate Detector
Image Zoom
Nightly Tester Tools
Session Manager

AdBlock Plus
Flashblock
Greasemonkey
Secure Login
Del.icio.us Complete
Scrapbook
Video DownloadHelper

AdBlock Plus
Greasemonkey
Brief
Scrapbook
AutoCopy
FlashBlock
Livejournal Hook
Minimize To Tray
Tab Preview
CuteMenus

Adblock Plus
Яндекс.Бар (только из-за контроля раскладки клавиатуры в адресной строке и погоды)
FlashBlock
Autocomplete Manager
Fasterfox
FeBe
TabMixPlus
Поиск по AG.ru (не знаю, почему-то в списке аддонов, добавляет сервер поиска)

NoScript
Adblock Plus
Tab Mix Plus
ScrapBook
CacheViewer
Grab and Drag
Menu Editor
URL Link
Extended Link Properties
ImgLikeOpera

Adblock Plus
Flahblock
ImgLikeOpera
Mouse Gestures
Super DragAndGo
Undo Closet Tabs Button
NoScript
Download Statusbar
IE Tab
Image-Show-Hide

- Adblock Plus
- Fission
- Flashblock
- FlashGot
- Forum.mozilla-russia.org
- Gmail Manager
- Google Browser Sync
- Link Alert
- Locationbar²
- PDF Download

Mouse Gestures (без него не могу обойтись)
Nightly Tester Tools
Firebug

0. NoScript
1. Adblock Plus
2. Tab Mix Plus
3. Img Like Opera
4. RefControl
5. Customise Google
6. Web Developer
7. SmothWeel
8. Searchbar Autosizer
9. Russian hot keys bugfix :whistle:

All-in-One Sidebar
ScrapBook
Add to Search Bar
Tab Scope
Firefox Showcase

1. Adblock Plus
2. All-in-One Sidebar
3. Firebug
4. Download Statusbar
5. FlashGot
6. Fast Dial
7. ImgLikeOpera
8. Update Notifier
9. NoScript
10. TabMixPlus

Эх, было б их 15 :)

1. Adblock Plus
2. All-in-One Sidebar
3. ImgLikeOpera
4. Tab Mix Plus
5. ScrapBook
6. Flashblock
7. Auto Copy
8. All-in-One Gestures
9. MR Tech Local Install
10. Clippings

1.Scrapbook
2.Adblock Plus+Element Hiding Helper
3.BlockSite
4.Stop Autoplay
5.Redirect Remover
6.Cs Lite
7.Add Bookmarks Here
8.Download Statusbar
9.Copy Link Name
10.Greasemonkey

ABP
ILO
TMP

LiveHTTPHeaders

1. ADblock Plus
2. Tab Mix Plus
3. All-in-One Sidebar
4. Save Image in Folder
5. BBCode
6. Thunderbird Biff
7. FlashGot
8. NoScript
9. Stylish
10. ScrapBook

1. ABP
2. Forum.mozilla-russia.org
3. ScrapBook
4. FEBE
5. Sxipper
6. zwordpress
7. SamePlace
8. Google Reader Watcher
9. MzExtPost
10. CLEO

AdBlock Plus
Scrapbook
Secure Login

CacheFixer
ImgLikeOpera
ScrapBook
FlashGot
All-in-One Gestures
No script
FlashBlock
SwitchProxy Tool
Xippee Extension
AdBlock Plus

1. Scrapbook
2. Minimize To Tray
3. ForecastFox
4. IE Tab
5. Fast Video Downloader
6. Coloris Preview

1.  Scrapbook
2.  ImgLikeOpera
3.  CacheFixer
4.  Session Manager
5.  IE Tab
6.  Work Offline
7.  Right Enconding
8.  Tab History
9.  Text Link
10. URL Corrector
No script
FlashBlock
AdBlock Plus
FlashGot
No Squint
MR Tech's Local Install
Accessibar
Close All Tabs
CuteMenus Crystal
Compact Menu
FireShot
Fox2CHM
PDF Download
Personal Menu

1. NoScript
2. Adblock Plus
3. Mouse Gestures
4. Linkification
5. Brief

FireFTP
All-in-One Gestures
FlashGot
Adblock Plus
ImgLikeOpera
Locationbar²
Bookmarker
Calculator
BBCodeXtra
Extended Statusbar

1. Adblock Plus
2. NoScript
3. Download Statusbar
4. FasterFox

1. Adblock Plus (!!!)
2. NoScript  (!!!)
3.  Simple Mail (!!!)
4. Auto Copy
5. Super drag & Go  (!!!)
6. Tab Clicking Options  (!!!)
7. Flashgot
8. Secure Login
9. Image Show-Hide + Show Picture
10. Copy plain text

1. Adblock Plus
2. Flashblock
3. Auto Copy
4. Flashgot
5. Foxmarks
6. Secure Login
7. Minimize To Tray
8. ImgLikeOpera
9. File Title
10. TabMixPlus

AdBlock Plus
Dictionary Search
Scrapbook
FEBE
Secure Login
Mr Local Install
Stop-or-Reload Button
:rock:

ImageLikeOpera
AdBlock
Scarbook
NoScript
FlashGot
MrTechLocalInstall
CacheFixer
Minimize to tray
Mouse Gester
Image Zoom

1. Adblock Plus
2. NoScript
3. Tab Scope
4. MR Tech Local Install
5. FAYT
6. Linkification
7. MR Tech Link Wrapper
8. Bookmark Duplicate Detector
9. FlashGot
10. DownThemAll!

1. TMP
2. All-in-One Sidebar
3. Download statusbar
4. MouseGestures/Firegestures (переползаю с первого на второе)
5. ConQuery
6. Scrapbook
7. Tab scope
8. MR Tech Local install
9. Aging tab
10. Drag de go

ScrapBook
Add to Search Bar
DOM Inspector
DownThemAll
ImgLikeOpera
Adblock Plus
NoScript
Compact Menu
Ez Sidebar
Nightly Tester Tools

Adblock Plus
Tab Mix Plus
All-in-One Gestures
Locationbar2
FireFTP
CuteMenus2
Fission
FlashGot
LiveClick
Update Notifier

1. NoScript
2. ImgLikeOpera
3. Adblock Plus
4. Tab Mix Plus

1. Adblock Plus
2. BBCode
3. Download Manager Tweak
4. FlashGot
5. MinimizeToTray
6. MR Tech Local Install
7. Ru-Board Navigation
8. Save Image in Folder
9. ScrapBook
10. Tab Mix Plus

Flashgot
Locationbar

1. URL Corrector
2. Text Link
3. Paste and Go
4. Next Image
5. Grab and Drag
6. Back to Top

1. AdBlock Plus
2. Flashgot
3. Locationbar2
4. All-in-One Gestures

FireBug
Adblock Plus
IETab

1. HTML VALIDATOR !!!
2. SecurePassword Generator !!!
3. Speed Dial
4. Secure Login
5. Translation Panel
6. All-in-One Sidebar
7. translator
8. Add Bookmark Here 2
9. minimizetotray
10. Extended Statusbar

1. AdblockPlus
2. ScrapBook
3. Firebug
4. Aardvark
5. IE View Lite
6. Fetch Text URL
7. All-in-One Sidebar
8. CS Lite
9. Fission
10. Tab Scope

1. Tab Mix Plus
2. ImgLikeOpera
3. Html Validator
4. View Dependencies
5. Web Developer
6. Sage
7. Russian/English Spell Dictionary
8. All-In-One Sidebar
9. FasterFox
10. Live HTTP Headers

ScrapBook
FlashGot
Яндекс.бар
Extended Statusbar
NoScript
MR Tech Local Install
Coloris Preview
Google Toolbar

Work Offline
MR Tech Link Wrapper
Paste and Go
Scrapbook
CacheViewer
Image Zoom
Flat Bookmark Editing
AutoCopy
NoSquint
Switch Proxy tool
AdBlock Plus

(последовательность - для набора баллов в надежде, что разрабы заметят на предмет включения в саму программу))

Adblock Plus 0.7.5.3
Auto Copy 0.6.4
BBCode 0.4.1.3
Bookmark Duplicate Detector 0.6.3
Copy Plain Text 0.3.3
Enhanced History Manager 0.5.8.05.1
External Application Buttons mod 0.7.3.4
FlashGot 0.7.5
Foxmarks Bookmark Synchronizer 2.0.41
Greasemonkey 0.7.20080121.0
ImageShack right-click 0.3.6
ImgLikeOpera 0.6.15
LiveJournal Addons 7.1
NoScript 1.3.1
Nuke Anything Enhanced 0.54
Paste and Go 0.4.3
Paste Quote 0.3.2
QuickNote 0.6.0.3
Resizable Form Fields 0.2.4
Restart Firefox 0.3.1
RSS Ticker 1.9.2
Secure Login 0.9.0.5
Super DragAndGo 0.2.6.2d1
Tab History 1.0.4
Tab Mix Plus 0.3.6.0.070923
Text Link 2.0.2007111301
VideoDownloader 1.1.1
Work Offline 1.3


Мне не выбрать самое лучшее, но если бы этих расширений не было я бы уже давно перешла на Оперу или симанку.

Adblock Plus
NoScript
ScrapBook
Bookmarks Tooltips
ImgLikeOpera

1. Scrapbook
2. AdBlock Plus
3. ILO
4. TabMixPlus
5. FlashGot
6. Secure Login
7. FlashBlock

mouse gestures
fire bug
html validator
aios
customitems

1. Adblock Plus
2. NoScript
3. ImgLikeOpera
4. Tab Mix Plus
5. DownThemAll!
6. OpenSearchFox
7. ScrapBook
8. CS Lite
9. SwitchProxy Tool
10. BBCodeXtra

1. AdBlock Plus
2. Tryagain
3. IE Tab
4. Nuke Anything Enhanced
5. Tab Mix Plus.
6. Flashblock
7. Torbutton
8. PDF Download
9. Extended Statusbar
10. Livejournal Addons

1. Web Developer
2. Adblock Plus
3. ImgLikeOpera
4. MR Tech Local Install
5. NoScript
6. Tab Mix Plus
7. ProCon Latte
8. Яндекс.Бар
9. Mozilla-Russia Navigator
10. Download Statusbar

1. AdBlock Plus
2. ImgLikeOpera
3. Brief
4. FlashGot
5. Save To CHM
6. TorButton
7. GMail Manager
8. TabMix Plus

1. Scrapbook
2. Download Statusbar
3. AdBlock Plus
4. NoScript
5. Locationbar
6. Redirect Remover
7. Flashgot
8. Tab Mix Plus
9. Firebug
10. Live HTTP Headers

1. Яндекс.Бар 3.0.3
2. Human URL 0.1.2
3. Tabbrowser Preferences 1.3.1.1
4. IE View Lite 1.3.2
5. Download Statusbar 0.9.5.3
6. translator 1.0.4.4
7. Link Alert 0.7.2
8. CacheViewer 0.4.4
9. FireFTP 0.97.1
10. IE Tab 1.3.3.20070528

Прочие любимые:

Cache Fixer 1.0
ChatZilla 0.9.80
CuteMenus - Crystal SVG 1.9.2
Extended Link Properties 1.2.5
Extended Statusbar 1.2.6
FaviconizeTab 0.9.7.4
Fission 0.9
Google Toolbar for Firefox 3.0.20070525W
GooglePreview 3.8
MR Tech Local Install 5.3.2.3
ShowIP 0.8.05
Split Browser 0.4.2007120601
wmlbrowser 0.7.17

Вот мой выверенный годами список расширений Firefox:

- Adblock Plus (куда ж нынче без него? с успехом заменяет NoScript, страдающий утечками памяти)
- Copy Plain Text
- Download Statusbar
- FlashGot
- IE View Lite (вместо дырявого IE Tab, через который утекает память)
- Image Zoom
- Linkification
- Paste and Go 2
- URL Corrector (после этого пользоваться другими браузерами становится практически невозможно - постоянно вводишь адреса страниц на русском)

Собственно, такой функционал почти универсален, т.к. будет полезен практически любому пользователю.

# Tab Mix Plus 0.3.6
# All-in-One Gestures 0.18.0
# Autocomplete Manager 2.2
# Secure Login 0.9.0.5
# IE Tab 1.3.3.20070528
# Aardvark 2.0
# Download Statusbar 0.9.5.3
# MR Tech Local Install 5.3.2.3
# Drag de Go 0.2.5
# GMarks 0.9.7.3

1. ScrapBook 1.3.2.6
2. Tab Mix Plus 0.3.6
3. Download Statusbar 0.9.5.3
4. FlashGot 0.7.7
5. Firebug 1.05
6. Web Developer 1.1.4
7. ColorZilla 1.9
8. SearchStatus 1.22
9. Яндекс тИЦ 0.5.5
10. Flashblock 1.5.5

Жаль, что только 10 :)
Пришлось выкинуть несколько достойных расширений...

1. Adblock Plus
2. Tab Mix Plus
3. Mouse Gestures
4. Tab Scope
5. Text Link
6. ScrapBook
7. DOM Inspector
8. All-in-One Sidebar
9. Greasemonkey
10. FlashGot

Adblock Plus
ScrapBook
Google Browser Sync
Bookmark Duplicate Detector
Organize Status Bar
DownThemAll
Copy Link Name
Linkification
Locationbar²
ImgLikeOpera

1.Tab Mix Plus
2.ImgLikeOpera
2.Mozilla Arhive Format
3.FlashGot
4.Fox2CHM
5.FlashBlock
5.IE Tab
6.Stop-or-Reload Button
7.Cache Fixer
8.CacheViewer
9.Fast Video Download
10.Promt 8.0

1. ImgLikeOpera
2. AdBlock+
3. FlashBlock
4. NoScript
5. TabMixPlus
6. CookieSafe

1.  Tab To Window
2.  Copy All Urls
3.  Auto Copy
4.  BBCodeXtra
5.  CoLT
6.  MR Tech Local Install
7.  OpenBook
8.  PDF Download
9.  CuteMenus - Crystal SVG
10. Flashblock

1. NoScript
2. FireFTP
3. SpiderZilla
4. Translation Panel

......ммммм, немного, но это мой максимальный минимум :)

1. Tab Mix Plus
2. All-in-One Sidebar
3. IE Tab
4. Adblock Plus
5. DownloadHelper
6. DownThemAll!
7. Forecastfox |10n
8. CustomizeGoogle

1.  Adblock Plus
2.  Mouse Gestures
3.  ColorfulTabs

4.  WebDeveloper
5.  Resizeable Form Fields
6.  IETab
7.  ImgLikeOpera
8.  MeasureIt
9.  Colorzilla
10. Add bookmark Here