A list of the most useful extensions and add-ons available for FireFox and IE. The list is no way exhaustive, so if you feel something has been left out which should’ve been included, please leave us a comment. Common extensions like Google toolbar, Stumble upon, Digg etc., are not included, nor are popular extensions which haven’t been updated for Firefox 3.
Greasemonkey
FireFox
Customize any webpage to add or enhance any functionality or look with JavaScript.
Scribefire Firefox
A must have for all serious bloggers. It’s a full fledged blog editor with support for WordPress, LiveJournal, Xanga, Live Spaces, Movable Type, Drupal, Blogger, and
more.
Me.dium
FireFox, IE, Flock
Socially browse the web. Confused? Well, me.dium lets you communicate with other users in real time while browsing the web. So you and your friends can surf the same website at the same time. It is been a recommended add-on for Firefox, IE and Flock!
BugMeNot
FireFox
Isn’t it annoying when you are visiting any website for the first (and probably the only time), but it asks you to register before going any further? Well, now there’s a solution; just use BugMeNot to bypass the registration process.
DownThemAll
FireFox
The only download manager you’d need in Firefox. It enables you to download everything from a site with a single click. It claims to increase download speed up to 400%.
Mini Map Sidebar
FireFox
Just Drag and Drop any address or a link to an address from any web page and view their location in the Map Sidebar.
PicLens
IE, FireFox, Safari
Transform your browser into a visual treat. Browse your favorite websites in a different 3d way.
Surf Canyon
Firefox, IE
Power-up your web search. Surf Canyon works with Google, Yahoo!, MSN and Craigslist. Locates relevant information which usually goes unnoticed, personalize it, and get recommended search results in real time.
Read It Later
Firefox
Interested in the news article you just stumbled on, but don't have time to read it now? Well, just bookmark it for reading it later. Read It Later Firefox extension allows you to do just the same, without having to bookmark the link so as not to clutter your bookmarks with one time use links.
Adblock Plus
Firefox, SeaMonkey, Flock
Block all unwanted banners, images etc. with this useful extension
IE View
Firefox
Firefox has come a long way in the last few years. But the sad truth is that still some websites exist which are designed specifically to work in IE. This extension lets you load any webpage in IE with a single right click.
Video DownloadHelper
FireFox
Download and convert embedded videos from YouTube like sites.
IE7Pro
IE
Probably the best Add on for IE7. It enhances IE7 with numerous useful features like Tabbed Browsing Management, Spell Check, Inline Search, Crash Recovery, Web Accelerator, AD Blocker, Greasemonkey like User Scripts platform, etc.. It makes IE7 more user friendly and secure at the same time.
RoboForm
Internet Explorer, FireFox
RoboForm simplifies your web experience by remembering your user names and passwords for various websites and filling them in for you. It also fills up any other web forms for you. It stores the data securely so you don’t have to worry about exposing your passwords.
Inline Search
Internet Explorer
Like the inline search feature in Firefox and wish that IE had similar search functionality? With this IE add-on, now you can get just that.
Hyperwords
FireFoxGet one-click access to references, searches, conversions, and translations, etc.. for any selected word.
Firebug
FireFox
A must have tool for any serious web developer. It lets you edit and debug CSS, HTML, and JavaScript live in any web page. It makes finding errors in your script a fun and easy task.
Web Developer Toolbar
Firefox, Flock, Seamonkey
'Web Developer Extension' is a collection of various web developer tools.
NoScript
FireFox
Want a browser safer than Firefox? Just install NoScript on Firefox. It blocks JavaScript, Java, and Flash scripts other than for sites you trust.
Stealther
FireFox
Don’t leave any trace of your browsing activities. Use this extension to temporarily disable Browsing History, Cookies, Downloaded Files History, Disk Cache, Saved Form Information and other such traceable information.
Sage Too
FireFox
A RSS and Atom feed aggregator for Firefox. No fancy features but does the job quite well.
Jeteye
FireFox, IE
Satisfied with your bookmarks? Don’t be. Spice up your bookmarks with Jeteye.
Blueorganizer
FireFox
BlueOrganizer provides you with a set of menus personalized based on your browsing history, which contain useful shortcuts for different actions.
ReminderFox
FireFox
It’s a handy extension that manages lists of date-based reminders and ToDo's. It helps you remember important dates with easy-to-use lists, alerts, and alarm notifications.