We have collected a big list of Firefox add-ons that will bring our social networking life into the browser. Here are more than 50 "must have" Firefox tools, toolbars and add-ons for every social networking user.
Shareaholic allows you to quickly share, bookmark, and e-mail web pages via a very wide array of your favorite web 2.0 social networking & bookmarking sites - such as Delicious, Digg, Facebook, Google Reader, MySpace, and StumbleUpon, without cluttering up your browser.

Socialphile Firefox Extension assists users with comfortable searching (Google, Yahoo, MSN, Google News) based on ranking of each search result at social news websites like Digg.com

StumbleUpon discovers web sites based on your interests, learns what you like and brings you more.
Me.dium - Be social when you surf the web. With Me.dium, you and your friends can chat and check out the same web pages at the same time. Me.dium also includes a handy place for all your Facebook needs without the hassle of applications, newsfeeds and ads.
2 Pane Bookmarks - This provides separated "Bookmarks" Sidebar panel like Opera. This splits the Bookmarks Sidebar panel with 2 panes. When you choose a folder from the above tree, the contents will be shown in the below pane.

Annotea Ubimarks - New bookmarks and topics can be added to, deleted from, and updated at the local bookmark files. These files can be kept local or published on the Web. WebDAV URIs can be used to make updating published bookmark files as easy as local files.
Bookmark Duplicate Detector - It helps you to find and delete duplicates URL already in your Bookmarks.
Bookmark Sync and Sort is a Mozilla Firefox extension that lets you connect to an FTP/WebDAV server and synchronize your bookmarks that are stored in an XML file. Setup is easy; just write in your FTP/WebDAV server address, username, password and a name for the XML file (by default called xbel.xml). To start, press Upload to create the file on the server and set if you want to automatically download the file on startup or sort and upload it when you close your browser. Based off of DougB's Bookmark Synchronizer 3 and Torisugari's Sort Bookmarks.
TagSifter - Firefox 3 lets you tag your bookmarks, but it doesn't give you a great way to browse your bookmarks by their tags. TagSifter tries to. Select a group of tags in the sidebar or menu, and TagSifter shows you all the related tags and bookmarks. Or search your bookmarks with set operators, like "tag1 - (tag2 + !tag3)". Comes with a tool to help tag your existing bookmarks as you move to Firefox 3.
Boox - Enhanced functionalities for your Bookmarks, in the Bookmarks Toolbar and the Sidebar.
Delicious Bookmarks - Delicious Bookmarks is the official Firefox add-on for Delicious, the world's leading social bookmarking service (formerly del.icio.us). It integrates your bookmarks and tags with Firefox and keeps them in sync for easy, convenient access.
del.icio.us buttons - This is the "classic" official extension for del.icio.us, with 'tag' and 'del.icio.us' buttons in the toolbar.
del.icio.us Complete 1.3 - It allows you to easily add sites you like to your personal collection of links, to categorize those sites with keywords, and to share your collection not only between your own browsers and machines, but also with others.
Enhanced Bookmark Search - Search by Title, Location, description or keyword including more subsets (contains, starts/ends with, is/is not, doesn't contain).
Firefox Google Bookmarks - Creates a menu to access google bookmarks from any computer. Needs Google Account to use this extension.
Flat Bookmark Editing - Edit bookmarks in the bookmark organizer, without opening the properties window.

Foxmarks Bookmark Synchronizer - If you use Firefox on more than one computer, you'll want Foxmarks. Install Foxmarks on each computer, and it works silently in the background to keep your bookmarks and (optionally) passwords synchronized. Foxmarks also keeps your data backed up and safe from computer failures. If you're away from your computer, Foxmarks allows you to access your bookmarks online by logging into my.foxmarks.com.
Magnolia - This is an extension made to ease the way users mark their bookmarks in "ma.gnolia.com".
GMarks - GMarks helps you sync & manage your bookmarks with Google Bookmarks.
Online Bookmark Manager is a free bookmark- & favorites service. Store and manage your personal link list in the world wide web. Keep your bookmarks in sync between multiple computers. Join the Online Bookmark Manager now.

Smart Bookmarks Bar extension comes right here by hiding bookmarks names and only showing icons. Bookmark names will be displayed on mouse over.
Yoono - In a single browser sidebar, Yoono users can interact with the best of the Web more than ever before by discovering, communicating, and sharing with friends across multiple networks and platforms all in one place. Users can stop wasting time checking for updates and visiting multiple networks and instead can start enjoying!
Add Bookmark Here ² - Add a menuitem "Add Bookmark Here..." to Bookmarks...
Google Bookmarks Menu - Creates a menu to access google bookmarks from any computer. Needs Google Account to use this extension.
Digg This! toolbar adds two buttons to your main Firefox toolbar and one menu. With the toolbar buttons you can quickly goto to Digg or Digg the page you are viewing. The menu allows you to goto your Digg profile or any of the top Digg categories.
The Digg Toolbar for Firefox lets you Digg, submit content, and keep track of Digg even when you're not on the Digg site itself. With a notification window built into the toolbar, you'll never miss a popular story or when friends Digg, submit, or comment on stories.
DiggThumbs - Adds website screenshot thumbnails to the listings on digg.com
MyPortal is Firefox extension that creates a live web page of your bookmark hierarchy. Leave My Portal open in a tab to easily browse, search, and open your bookmarks and live bookmarks.
TwitterBar is an extension for the Mozilla Firefox Web browser (originally written by Tony Farndon) that allows you to post to Twitter from the Firefox address bar. Just type your tweet in the address bar and click the TwitterBar icon to send it to Twitter. You can also post the URL of the page you're currently reading by clicking the TwitterBar icon with typing in the address bar. (plus it doesn’t hog any of your precious toolbar/statusbar space!)
Facebook Toolbar - Integrate your Facebook life into your browser. Search Facebook from anywhere The Search Box allows you to easily search Facebook no matter where you are. Select a friend from the dropdown to go directly to their profile, or hit “enter†to see the search results.
Clipmarks - Instead of copying and pasting links, Clipmarks is like adding a pair of scissors to your browser, letting you capture exactly what you want others to see (text, images or video). Your clips are saved on clipmarks.com and can easily be syndicated to FriendFeed, Twitter, Facebook or other sites.
Read It Later 0.9821 - 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.
Yahoo! Toolbar - Use Yahoo! and the web faster, safer, and easier with new mail notification, search suggestions, online bookmarks, free spyware scanning, and more...
TinyUrl Creator - Easy shrink any long URL or link in the page to something you can email or Twitter using the TinyUrl service with a single click in your browser.
Bookmarks on line - This FireFox Extension allows you to synchronize your bookmarks with our server to have the same bookmarks both at home or in the office or on whatever computer you have. Everything with few clicks and free!.
GetBoo - Add a bookmark to your GetBoo account, and access it from a single click.
Foxylicious - Foxylicious is a Mozilla Firefox extension that integrates your del.icio.us bookmarks into your browser...
NeedleSearch lets you bookmark the search engines of your choice. Because of the easy and powerful Auto-add functionality NeedleSearch not only lets you bookmark this big search engines like Google or Yahoo, but also the search engines for which...
Groowe Search Toolbar - Groowe Search Toolbar bundles toolbar functions for many search engines, shopping sites, download sites, including Google toolbar, Yahoo, Amazon, EBay, Ask, Msn, Download.com, Wikipedia, Digg, del.icio.us and others. The entire toolbar...
NetMarks Manager - Store and easily manage your web bookmarks. This extension lets you open NetMarks Manager and capture bookmarks from Firefox. Then you can write notes, search, keep track of your favorites and most popular, check for duplicate bookmarks...
MyVmarks Tools - Tools to access MyVmarks online bookmark manager.
LiveClick - Adds feed reading, notifications, favicons, and other enhancements to Live Bookmarks.
BlinkList Toolbar - A custom Firefox toolbar for use with BlinkList.com.
Metawishlist Toolbar - A custom Firefox toolbar for use with MetaWishlist.com.
Blogmark - Easily add a new blogmark (blogmarks.net) thanks to a menu item in the context menu of the page. There are also toolbar buttons to add or view.
LinkedIn Companion for Firefox - LinkedIn is an online network of more than 25 million experienced professionals. LinkedIn helps you be more effective in your daily work and opens doors to opportunities by helping you develop and manage your network of business.
Kaboodle - The Kaboodle extension for Firefox has everything you need to use Kaboodle with your Firefox browser. Kaboodle is the best way to collect, compare, share and discover things you find anywhere on the web. Things that you are looking for, things that you wish for, things that you have or things that you just find interesting!
Mister Wong Toolbar - Mister Wong is a german social bookmarking service for saving, sharing and publishing your bookmarks. Discover new interesting bookmarks, add your Buddys and share Bookmarks within Groups.
Diigo: Web Highlighter and Sticky Notes - This official Diigo add-on seamlessly integrates your browser with Diigo.com, the next-generation social bookmarking and annotation service on the web. It provides the following enhancements that can make your browsing experience and research process on web much more productive.
folkd integrates the social web directly into your browser! Discover and submit webpages, news, audio, video and blogs.
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[...] NDK Team wrote an interesting post today onHere’s a quick excerptDiggThumbs. MyPortal is Firefox extension that creates a live web page of your bookmark hierarchy. Leave My Portal open in a tab to easily browse, search, and open your bookmarks and live bookmarks. MyPortal … [...]
Headup - An outstanding social addon
I love all these social addons. I have recently discovered a great new one! It's called headup:
http://www.headup.com
Connects all your data from: Facebook, Twitter, Myspace, LinkedIn, IMDB, Flickr, Gmail, Yahoo, FriendFeed, Picasa, LastFm and many more!
Shows your exactly what you need to know while you browse. Try it out!
On firefox: https://addons.mozilla.org/en-US/firefox/addon/10359