A bunch of add-ons that help using the soicial communities such as msn, plurk, twitter, facebooks and friendster..,etc.
Find out which websites you can trust. WOT adds intuitive traffic light-style icons next to search results and URLs to help you make informed decisions about whether to visit a site or not.
Shareaholic is the easiest way to share interesting links using Facebook, Twitter, Google Mail, Reader, Bookmarks, Evernote, Bitly, StumbleUpon, and more... from one simple ALL-IN-ONE add-on. This is the ultimate tool for the link sharing addict!
ShareThis for FireFox makes sharing simple. Share anything on the web with your friends on 45+ social sites including Facebook, Twitter, Email, Digg, Reddit and more. Track top trending shares by site and automatically save content to your ShareBox.
Send and receive signed and encrypted messages in Gmail.
The most customizable Bookmarks Bar ever. Fit more websites, search right from the Bar, use social sites. Move the bar anywhere and in any smart layout you want.
GetGlue helps you find your next favorite movie, book, or music album. As you visit sites like Amazon, IMDB, and Wikipedia, GetGlue suggest things you'll like.
The fastest way to use Nice Translator in Firefox.
Follow updates at: http://twitter.com/tumbledesign
Keeps deviantArt always near by showing you when new messages arrive for you and giving quick access to them.
Note: please press Ctrl + / on Windows or Cmd + / on Mac to display the extension. Will be fixed in the next version, sorry :(.
Note from Mozilla: This add-on has been discontinued. Try Evernote instead.
Clipmarks lets you clip and share specific parts of articles, or anything else you read.
YammerFox puts a small yammer logo in the lower right corner of your Firefox browser. When new messages arrive it pops up a small window with the message. Click the logo to display a list of the last twenty messages, reply or post new messages. Works...