Firefox was the fastest growing popular web browser in 2008 and its chances are bright to be fastest growing web browser. There are lots of ease provided by the firefox and this is the main reason for its popularity. There are lots of free download able extensions and add-ons available on the internet for firefox, we also featured them before and there demands are increasing every day. In this post, I am listing down 21 Amazing Firefox Ad-Ons That You Must-Have In 2009.

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Xoopit

Get Xoopit to Upgrade Gmail to search, browse & share files, photos & videos. Use Google Search while composing mail in Gmail. Get information about people in a Gmail conversation. Xoopit works for Gmail, Google Mail and Google Apps users.

Inquisitor

Inquisitor speeds up your searches like no other. Start typing and websites appear instantly, along with suggestions to help refine your search. Inquisitor understands you, learning and tailoring your results as you search more.

Hide Navigation Bar

This extension enables you to hide the navigation bar through a toggle button. Currently the toggle button is the F2 key. You can change the key in the extensions options, as well as configure whether you want the Navigation Bar to be displayed on an initial Firefox launch. Also allows you to enable an Auto-Hide mode if you wish to use that instead.

ScribeFire Blog Editor

ScribeFire is a full-featured blog editor that integrates with your browser and lets you easily post to your blog. You can drag and drop formatted text from pages you are browsing, take notes, upload images, and post to multiple blogs.

Interclue

Ever wanted to know what was behind the link before you clicked? Interclue tells you everything you need to know before you open yet another tab.

Evernote

This will Provides a button and context menus to easily add a selection or an entire page to Evernote. It can works on Windows, Mac & Linux.

Glubble for Families

Glubble evolves the web from a personal activity into a fun experience for the whole family. Parents and children connect, play, discover and learn through fun activities. A family page, games, chat, surfing, play art, educational exercises and more.

Fotofox

You can easily select, tag, title and upload pictures from your computer to an online photo service. It will works with Flickr, Tabblo, 23hq, SmugMug, Marela, Kodak EasyShare Gallery, Pixelpipe, and Zooomr.

Cooliris

Cooliris (formerly PicLens) transforms your browser into a visually stunning, lightning fast way to search, discover, view and share online photos, videos and more. Their unique “3D Wall” lets you effortlessly zoom your way around thousands items on a single, ever-expansive wall. It’s the fastest way to search and enjoy Google Images, YouTube, Flickr, Hulu, and hundreds of other sites.

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.

Fast Dial

Fast Dial replaces blank tabs with a panel of thumbnails of your favorite sites.Â Fast Dial bookmarks are stored as Firefox bookmarks. Thus it’s possible to manage Fast Dial bookmarks using Firefox Bookmark Manager and Bookmark Sidebar.

Yoono

Yoono simplifies your social life on the web by centralizing all your social networks and instant messaging in one easy to use browser sidebar. Get all your friend updates automatically wherever you are on the web and update your status instantly across Facebook, MySpace, Twitter, and more.

Shareaholic

If you use sites like Facebook, MySpace, Digg, Gmail, Twitter you’ll want Shareaholic. Winner of the Extend Firefox contest, Shareaholic enables you to quickly, and very easily share, bookmark, and e-mail web pages via a wide array of your favorite web 2.0 social networking & bookmarking sites — such as Digg, Facebook, Gmail, MySpace, StumbleUpon, and many many others.

NoScript

The best security you can get in a web browser.It allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.

DownThemAll

DownThemAll is all you can desire from a download manager. It features an advanced accelerator that increases speed up to 400% and it allows you to pause and resume downloads at any time.

Power Twitter

Power Twitter adds features to the Twitter Web interface including displaying Flickr photo and YouTube videos. TinyURL links are also unwound to show the destination page title. Finally, any additional social information (blogs, photos, etc.) that match for the Twitter user are displayed in a news feed in the side bar of the Twitter page.

Toggle Private Browsing

Toggle Firefox’s built-in private browsing mode with a toolbar or status bar button. You can also toggle Firefox to auto-start in private browsing mode.

OutWit ImagesÂ

OutWit Images allows users to quickly navigate through Web pages and search engine results to harvest countless images automatically or manually. It is a free Firefox 3 add-on compatible with Windows, Mac OS, and Linux. OutWit Images distinguishes itself by allowing users to easily save the pictures onto their hard disk while they browse through the results.

Juice

Juice by Linkool Labs is an intelligent discovery engine that integrates seamlessly with your browser. Highlight and move a chunk of text, and Juice directly delivers a set of rich, relevant content (e.g. news, blog posts, photos, videos etc.) to a sidebar area of your browser. You can bookmark and organize your content for current or time-shifted consumption.

TooManyTabs

TooManyTabs allows you to store up to over 50 tabs in multiple extra rows in your browser by a simple click. It saves your browser’s space and memory as idle tabs are put aside. The extra rows also help to better prioritize and visualize your tabs.

Sxipper

Sxipper makes interacting with the Web simpler by keeping track of an unlimited number of usernames, passwords and personal information such as name, address, phone numbers, etc. Presented as you need it, Sxipper securely stores this personal data on your computer.