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.
Add a menuitem "Add Bookmark Here..." to Bookmarks...
AutoAuth automatically submits HTTP authentication dialogs when you’ve chosen to have the browser save your login information.
Add useful extra features and skins to Gmail, like hierarchical labels, macros, file attachment icons, and more.
Preview web pages inline in Google Reader, collapse the header and sidebar for more reading area, get a Mac OS X like skin, add favicons to feed subscriptions and more with Better GReader.
** Add persistent highlights and sticky notes to anywhere on any webpage...
View and manage downloads from a tidy statusbar - without the download window getting in the way of your web browsing.
Provides a button and context menus to easily add a selection or an entire page to Evernote. Works on Windows, Mac & Linux.
Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page...
A customizable mouse gestures extension which enables you to execute various commands and user scripts with five types of gestures.
FireShot is a Firefox extension that creates screenshots of web pages.
Unlike other extensions, this plugin provides a set of editing and annotation tools, which let users quickly modify captures and insert text and graphical annotations. Such functionality will be especially useful for web designers, testers and content reviewers.
It's possible to choose whether entire web page or only visible part of this page should be captured.
Screenshots can be uploaded to server, saved to disk (PNG, GIF, JPEG, BMP), printed (NEW!), copied to clipboard, e-mailed and sent to external editor for further processing.
If you use Firefox on more than one computer, you'll want Foxmarks. Install Foxmarks on each computer, and it will work silently in the background to keep your bookmarks synchronized. You can also log in to my.foxmarks.com to manage your bookmarks from any computer.
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.
Allows you to customize the way a webpage displays using small bits of JavaScript. ...
E Tab - an extension from Taiwan, features: Embedding Internet Explorer in tabs of Mozilla/Firefox...
LeechBlock is a simple productivity tool designed to block those time-wasting sites that can suck the life out of your working day. All you need to do is specify which sites to block and when to block them.
Rearrange or remove menuitems from the main context menu (right-click menu) and main menubar (File Edit View etc.)
ReminderFox displays and manages lists of date-based reminders and ToDo's. ReminderFox does not seek to be a full-fledged calendar. In fact, the target audience is anybody that simply wants to remember important dates (birthdays, anniversaries, bills, etc) without having to run a whole calendar application. ReminderFox makes sure you remember all of your important dates via easy-to-use lists, alerts, and alarm notifications.
Server Spy indicates what brand of HTTP server (e.g. Apache, IIS, etc.) runs on the visited sites.