Firefox addons helps to increase the performance of the firefox up to a great extend by adding extra features in to it. They are lots of firefox addons are available now. The top 10 most needed addons are described below.

1.) PDF Download
This is an excellent addon for converting and downloading web pages in to PDF by a single click!
https://addons.mozilla.org/en-US/firefox/addon/636

2.) Nodofollow
This addon Highlights links in web pages according to their dofollow / nofollow status. This is a highly recommended addon for webmasters for seo.
https://addons.mozilla.org/en-US/firefox/addon/5687

3.) Search status
This addon displays Google PageRank, Alexa rank, Compete ranking and SEOmoz Linkscape mozRank with lots of seo tools.
https://addons.mozilla.org/firefox/addon/321

4.) Un plug
This addon saves embedded videos and audios with a single click. Its a brilliant addon and i highly recommended it. This addon compitable with Downthemall.
https://addons.mozilla.org/en-US/firefox/addon/2254

5.) Read It Later
Read It Later allows you to save pages of interest to read later. It eliminates cluttering of bookmarks with sites that are merely of a one-time interest.
https://addons.mozilla.org/en-US/firefox/addon/7661

6.) FireFTP
FireFTP is a free, secure, cross-platform FTP client for Mozilla Firefox which provides easy and intuitive access to FTP servers.
https://addons.mozilla.org/en-US/firefox/addon/684

7.)FoxyProxy
Foxproxy addons remove the limitations of traditional limitations of proxy settings of firefox browser
https://addons.mozilla.org/en-US/firefox/addon/2464

8.) Downthemall
The first and only download manager/accelerator built inside Firefox. Its a brilliant addon which really speed up downloading speed up to optimum level.
https://addons.mozilla.org/firefox/addon/201

9.) Fox tab
FoxTab brings innovative 3D functionality to your Firefox. FoxTab is a 3D tabbed browsing extension. With 6 attractive layouts to choose from, flipping between opened tabs becomes both easy and fun.
https://addons.mozilla.org/en-US/firefox/addon/8879

10.) FEBE
This addon is used for making back up of firefox addons. It saves firefox addons as .xpi file.
https://addons.mozilla.org/en-US/firefox/addon/2109

(This great promo is originally posted on last November and now also this promo is 100% working, so i reposted it)
The treasure seekers promotion is discovered by me, so dear webmasters please link to this source on your posts.

Bigfish games are very nice by its simplicity and graphics. By several promotions, you will get atleast 8 bigfish full version games for completly free(actually $55.92 value). Just go to this promotional pages and fill it up, they will send coupon codes to your email . If you dont have a bigfish account, you need to create it(free).
1.) Treasure seekers promo, click here(Get treasure seekers for free)
2.)Verbatim promo, click here.(unlock any 2 games from this- Atlantis, Fairies, Top Ten Solitaire, Word Search Deluxe, Slot Words.)

3.) Borders promo, click here.(Get Mystery case files huntsville and mahajong towers entinity for free)

4.) Bn promo, click here(Get haunted hotel for free.)


5.)Hallmark promo, click here(Get any 1 from below plus sudoko for free)
Get mystery case files huntsville or mystic inn or mahajong towers plus sudoko for free.
How to use it?
Sign up or login to bigfish games account. if signup, Dont forget to activate your bigfish account by going to your mail inbox. You must need to download and install Big fish gamemanager ,after it download any of these games. Then go to this promo links and fill it up. You will get coupon codes via email and apply these coupon codes on checkout. This coupon codes can be used only once.

Advanced SystemCare PRO Edition is now for free (Actually $29) for everyone as a Celebration for the 5th birth anniversary of Advanced SystemCare. Advanced SystemCare PRO Edition is a powerful optimization software from iobit. To get this free offer, simply follow the steps below.

1.) Go to this promotional page to get Advanced SystemCare PRO Edition for Free for 1 year.

2.) Select any one of the answer from there

3.) Enter the verification code (verification code is case sensitive) and press 'Get Free License' button

4.) Then you will get license key and account name

5) Download the latest version from here and install it, thats only...

I noticed that they are giving same account name and license key for anyone through this promo. They are,
 Account Name: ASCfrhdaz
License Code: 97FE-97FE-F0FF-44CC