here comes the list.obviously user have his own need.so we cant mention this is top of the 10 but i can give you top add-on for your need.

i found some best top 10 Firefox add-on’s that you cant live once you get addicted.
i can surely assure you its a worth following post

here comes the list..

if you are download freak ….

1)Down them all :

The first and only download manager/accelerator built inside Firefox!
download multiple videos,images,mp3,mp4 mpeg’s any thing which can be downloaded.

its very easy to use.just give the location and at “down Them all”

Download “down Them all “ add-on

2)Easy YouTube downloader:

I personally use this add-on.it can download you tube video as

FLV 3GP MP4

when ever you open a video it will show you 3 options beside the video

Download” Easy YouTube downloader”

For faster browsing and easy navigation

3)Smarter Fox:

SmarterFox is the most popular productivity addon. Save your time -
get faster, parallelized downloads of links/images/video, auto-load the
next page when you reach the end, instantly search from the URL bar or pop-up bubble.
search in major search engines instantly
with  a pop up bubble when you highlight text

Download smarter FOX

4)skip screen:

Skips unnecessary pages on sites like

Rapidshare, Megaupload, zShare, Mediafire and more..

when ever you try to download some thing from rapid share.it ask you to wait for 30 sec 90 sec according to the sixe of the file.when you install this add-on you will directly get download file asking you to save target as…

Download skip screen

5)All-in-One Gestures:

This extension allows you to execute common commands using mouse gestures, rocker navigation, scroll wheel navigation and page...

Download All-in-One Gestures

6)cool previews:

Truely cool as the name suggests.this add-on allows you to preview a website before opening it.the only thing you  need to do is mouse over the link or image and click on cool preview icon. a window pop-ups and give you preview of website or image or link

Download cool previews

7)Tree style tab:

This provides tree-style tab bar, like a folder tree of Windows Explorer. New tabs opened from links (or etc.) are automatically attached to the current tab. If you often use many many tabs, it will help your web browsing because you can understand relations of tabs.

Features:
* You can collapse/expand sub trees. It is convenient for too many tabs.
* When you close a tab which has collapsed sub tree, all of tabs in the sub tree will be closed only one action.
* The tree of tabs can be showing at right side.
* Vertical tab bar cab be shown/hidden automatically.
* You can open new tab between existing tabs, dropping link or URL string there.
* New child tab can be opened automatically from the location bar, if the website is same to the current tab's. Of course, different website can be opened in new tab too.
* A link can be loaded in new child tab automatically if it is to a different website. If you wish, you can load any link in new child tab.

The below video demonstrates how to use it.

this video made by  labnol

Download Tree style tab

8)All in one side bar:

All-in-One Sidebar (AiOS) is an award-winning sidebar control, inspired by Opera's. It lets you quickly switch between sidebar panels, view dialog windows such as downloads, extensions, and more in the sidebar, or view source or websites in the sidebar.

Download all in one sidebar

For network and mail updates

9)Gmail manager:

The original Gmail notifier for multiple accounts. Allows you to receive new mail notifications along with viewing account details including unread messages, saved drafts, spam messages, labels with new mail, space used, and new mail snippets.

Download Gmail manager

10)way2sms 160by2:

From this toolbar, you can login into way2sms.com and 160by2.com user accounts.
you can send sms at ease with features like instant sms, group sms, multiple sms, phonebook retrieval. Further info look below in Long description.

This toolbar comes up with features like
- Auto Login with Firefox Open
- Remember Username & Password
- PhoneBook to Send SMS Fast
- 675 chars long message can be sent at once
- Sender Id given by Way2sms with 140 char long sms
- Add Contacts to Phonebook from Toolbar
- Automatic New Version Notifier
- Shortcut keys to SMS fast
- Excellent Professional Looks & easy Interface

Download combo toolbar for way2sms and 160by2

Apart from all these add-on’s if you need a 3d look for your browser for viewing images videos and websites download this add-on

Cooliris:

download cooliris