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every body just add your favorite firefox extension and how it is useful

Too Useful In Developing Web Application To Find Out Bugs , Source

Web Developer

Useful in Analyzing A Web Site

Backing Up Firefox extensions , profiles , passwords .... everything

Fire FTP

Use FTP Protocol without Any Other Program

Faster Fox

Measures The Time To Open A Page

Fire Bug
Web Developer
Smiley Xtra 4
Cool smilies
Google Toolbar
Useful for searching in Google without accessing it.
Tor Proxy
Anonymous proxy
Reload Every
Reloads the page every n seconds.
Flash Got
Good for integration with most download managers, especially Flash Get.
Google Pedia
Whenever you search in Google you'll see related articles from Wikipedia on the same page of the results.
IE Tab
Opens the page inside Internet Explorer tab within Firefox.
Minimize To Tray
Sends Firefox to the system tray instead of minimizing it. (Good when used with reload every on the tracker page in the work).

At the end we find:

 

good to browse links without leaving your current page

down themAll!:

 downlad mangaer let you download every links in the page

also Anonymous proxy but more faster than the slowest one (tor proxy )

tab Scopy:

let you preview and navigate tab contents through popup

and my favorite one all-in-One Sidebar :

try it to see what it does

i didn it like it too much

i'll add one favorite of my heart

Google NoteBook

i can collect some information when i'm surfing some millions of pages

Good With RapidShare

BBCodeXtra:
To insert BBCode and HTML tags in forums.
Ad Block Plus:
To block ads.
FlashGot:
Useful for picking URLs to download ("FlashGot All" and "FlashGot Selection").

here're my favorits 

01. Show my IP
This add on shows your current ip

02. IE Tab
This add on opens an internet explorer tab inside your firefox browser " title="Smile" /> cool one

03. FireBug
This is one of the best, it gives you tools to debug, trace and make variable watches for all your page contents (html, javascript, css), it's wonderful for web developers

04. RelodeEvery
This add on refreshes your page each specified time

05. SwitchProxy
You can store several proxies and switch between them easily

06. DownThemAll
No need to use download managers " title="Smile" />
You can pause, resume and divide your download into several parts to raise up speed with firefox downloads

07. MinimizeToTray
This add one lets you minimize your firefox window to the system tray

08. VideoDownloadHelper
No need for programs to download videos from websites like youtube or metacoffee, This add on do all the work

09. TabEffect
This add on gives you a nice 3D effect when switching between tabs

10. PrayTimes
Using this you can specify your city and see the next pray time with alarm when it's time for it

11. WebDeveloper
This is one of the best for every one who is interested in the web, You can do whatever you want with any page on the web, I prefer that you read its description on mozilla website

12. PDF Download
Usually when u click on a link which refers to a pdf file, the pdf file is opened inside the browser and you have to wait til that time, but this add on will ask u if u want to open it or download it

13. Fire FTP
This add on will give u a complete FTP Manager

14. Colorful Tabs
This add on is going to give a different color for each tab you open inside your firefox window

15. All in one side bar
I like this add on, It gives you all (downloads, add ons, history, themes, ...) inside one bar to the left of your screen, and you can hide it, so when you open downloads window, you'll get your downloads inside it, not in a separate window

16. Alexa Sparky
This add on gives you alexa rate for the website (which is becoming the standard online) and you give hits for all the websites you visit (alternative for Alexa tool bar in IE)

I have some other nice add ons
I'll put them later

1-DownThemAll: download manager for Firefox.

2-Fasterfox: performance and network tweaks for Firefox.

3-IE Tab: embeds Internet Explorer in a Mozilla/Firefox tab.

4-McAfee SiteAdvisor: is an Internet service that warns users when downloading software or filling out forms on a web site that may make them victims of malware or spam.

5-Tab Mix Plus: Tab Mix Plus enhances Firefox's tab browsing capabilities. It includes such features as duplicating tabs, controlling tab focus, tab clicking options, undo closed tabs and windows, plus much more. It also includes a full-featured session manager...

ملاحظة: هي ال add on فيها ميزة ظريفة أنو بتعطي مساحة أكبر لل tabs (أكتر من سطر)

وطلع كمان بيعمل هي:

Arch View is an extension of Firefox. It can open archive file online and get the catalog. It also can preview or download files in archive. Currently, it support ZIP and RAR formats. The most peculiar feature of ArchView is that it can open an individal file without download the whole archive, since it only fetch the necessary portion. So it's suitable for checking the content of archive before download. ArchView can support HTTP and FTP protocols. It can also handle local files via file: protocol.