Facebook Messenger lets you bring a Facebook Messenger right into your browser to chat with your friends.
Facebook Share Button lets you share any web page on your Facebook Timeline by a quick Facebook button.
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.
Share on Google+the current URL. Click right and click "Google+ Share".
Display your friend's time line of Twitter on your browser tool bar.
Collections are groups of related add-ons that anyone can create and share.Explore Collections