According to statistics of w3schools FireFox has taken 46% of the total count among all other browsers.
The free open source ADD-Ons make it even more user friendly.So,here is a list of ADD-Ons.
1.Foxmarks Bookmark Synchronizer 2.6.0
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.
Hundreds of scripts, for a wide variety of popular sites, are already available at http://userscripts.org.
Automatically find Greasemonkey scripts on Userscripts.org (requires Greasemonkey).
When you visit a web page that has compatible user scripts on Userscripts.org, this extension will highlight the Greasemonkey icon in the status bar. Right click the Greasemonkey icon and choose the “X scripts available” item to see and install the scripts available for the current page.
Note that Greasefire uses a local index to look up scripts that apply to the page you are on — it does not send any browsing data to a server. The index is updated periodically, see Add-ons -> Greasefire -> Preferences for details.
Works with: * Firefox: 3.0 – 3.1b3pre
WOT, Web of Trust, warns you about risky websites that try to scam visitors, deliver malware or send spam. Protect your computer against online threats by using WOT as your front-line layer of protection when browsing or searching in unfamiliar territory. WOT’s color-coded icons show you ratings for 21 million websites – green to go, yellow for caution and red to stop – helping you avoid the dangerous sites. Surf safer and add WOT to your Firefox now.
Firebug 1.3 requires Firefox 3.0.
Drag photos,Music,Videos and arrange pictures adding photo titles, and create albums by multi-selecting photos, and then upload to one of a selection of online photo services – all of this without interrupting your Internet browsing.
Cooliris transforms your browser into a lightning fast, cinematic way to browse online photos and videos. Our “3D Wall” lets you fly through thousands of items in the blink of an eye on a infinitely expandable wall. To enjoy Cooliris on Google Images, Facebook, YouTube, Flickr, and hundreds of other sites, click the Cooliris icon that appears when you mouseover media on the supported site. Or enjoy Cooliris anytime by clicking the browser toolbar icon.
View and manage downloads from a tidy statusbar – without the download window getting in the way of your web browsing.
StumbleUpon discovers web sites based on your interests, learns what you like and brings you more.Very good for killing time also.
10.Tab Mix Plus
Tab Mix Plus enhances Firefox’s tab browsing capabilities. It includes such features as duplicating tabs, controlling tab focus, tab clicking options, undo closed tabs and windows, plus much more. It also includes a full-featured session manager.
The original Gmail notifier for multiple accounts. Allows you to manage multiple Gmail accounts and receive new mail notifications. Displays your account details including unread messages, saved drafts, spam messages, labels with new mail, space used, and new mail snippets.
Speeds up your browsing experience.
Displays a country flag depicting the location of the current website’s server and provides quick access to detailed location and webserver information.
Adds a 3D animation while changing tabs(sad firefox 3.0 wont support).
Just shows a splash screen while browser starts(just funky…no utility).
Ever been annoyed by all those ads and banners on the internet that often take longer to download than everything else on the page? Install Adblock Plus now and get rid of them.
Colors every tab in a different color and makes them easy to distinguish while beautifying the overall appearance of the interface.
Get international weather forecasts from AccuWeather.com, and display it in any toolbar or statusba
The best security you can get in a web browser! Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.
Get Alexa data in your statusbar!
Display PageRank for active URL.
Adds a menu and a toolbar with various web developer tools.
It can be used to block images in webpages from loading, again saving some bandwidth. Useful for dial-up users and limited broadband users.
Again helps to save bandwidth. Especailly useful if you like to stumble. You can choose whether you want to load a flash object or not.
25.Video download helper
The easy way to download and convert Web videos from hundreds of YouTube-like sites.
This works also for audio and picture galleries.
Download all the links, movies and audio clips of a page at the maximum speed with a single click, using the most popular, lightweight and reliable external download managers.