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	Firefox Extensions - https://addons.mozilla.org/firefox/extensions/ Official list from Mozilla Update. Extensions are small add-ons that add new functionality to Firefox.
	Mozdev - http://www.mozdev.org/ Provides free project hosting and development tools for extensions. Includes bug tracking, CVS repositories, mailing lists, newsgroups and download mirrors.
	ChatZilla - http://chatzilla.hacksrus.com/ A simple, straightforward Internet Relay Chat (IRC) client.
	Accessibility Extensions for Mozilla/Firefox - http://firefox.cita.uiuc.edu/ Toolbar to help users navigate pages, and also tools for developers to check their pages. Installation instructions and documentation.
	Google Extensions - http://www.google.com/tools/firefox/ Includes the Google Toolbar, Google Browser Sync, Google Notebook and Google send to phone.

	Piggy Bank - http://simile.mit.edu/wiki/Piggy_Bank Piggy Bank is an extension to the Firefox web browser that turns it into a “Semantic Web browser.”
	Glubble - http://www.glubble.com/ Creates a trusted surfing environment for kids. Allows you to set sites that you trust for your kids, comes with a starter pack.
	DownThemAll - http://www.downthemall.net/ Download in just one click all the links or images contained in a web page.
	Health On the Net (HON) - http://hon.mozdev.org/ A collection of Firefox plugins to support the Health On the Net foundation.
	Linky - http://gemal.dk/mozilla/linky.html Aims to increase the user's power to handle links in Mozilla.

	Launchy - http://gemal.dk/mozilla/launchy.html Adds a menu to open different types of links like images, emails, ftp, audio, and video with external applications. Includes overview, customization details, version history and screen-shots.
	Extension Room - http://extensionroom.mozdev.org/ Categorized list with details of extensions for Mozilla applications.
	LiveHTTPHeaders - http://livehttpheaders.mozdev.org/ Adds various functions for handling HTTP Headers.
	MozBraille - http://mozbraille.mozdev.org/ Self-voicing and Braille output based on the Mozilla browser.
	FireFTP - http://fireftp.mozdev.org/ A free, secure, cross-platform FTP client.

	IE Tab - http://ietab.mozdev.org/ An extension from Taiwan, embeds Internet Explorer in a Mozilla/Firefox tab.
	Fasterfox - http://fasterfox.mozdev.org/ Performance and network tweaks for Firefox.
	Flashblock - http://flashblock.mozdev.org/ Blocks all Flash content in a web page from loading automatically and allows selective activation and whitelisting of sites.
	wmlbrowser - http://wmlbrowser.mozdev.org/ Simulate WAP browsing by viewing WML (Wireless Markup Language) pages in Mozilla Suite, SeaMonkey or Firefox.
	CLiCk, Speak - http://clickspeak.clcworld.net/ An open source extension designed for sighted users who want text-to-speech functionality.

	Deepest Sender - http://deepestsender.mozdev.org/ Post to LiveJournal (and LiveJournal based sites) directly from Firefox.
	Link Evaluator - http://evaluator.oclc.org/ Evaluate the availability of on-line resources.
	Foxmarks Bookmark Synchronizer - http://www.foxmarks.com/ Automatically synchronizes your bookmarks between two or more computers running Firefox. Includes a feature to access your bookmarks from any computer.
	Download Statusbar - http://downloadstatusbar.mozdev.org/ Allows to keep track of ongoing and completed downloads in a statusbar.
	AutoCopy - http://autocopy.mozdev.org/ Transfers text to the clipboard as soon as it's highlighted.

	InFormEnter - http://informenter.mozdev.org/ Extension for Mozilla Firefox for form filling in semi-automatic mode.
	Session Manager - http://sessionmanager.mozdev.org/ Saves and restores the state of all windows, either when you want it or automatically at startup and after crashes.
	Menu Editor - http://menueditor.mozdev.org/ Allows you to customize the menus in Firefox and Thunderbird.
	Adblock Plus - http://adblockplus.org/ Blocks advertising, banners and other unwanted stuff on websites.
	Fire Vox - http://www.firevox.clcworld.net/ An open source suite of extensions that turn Firefox into a talking browser for the visually impaired.

	Preferential - http://preferential.mozdev.org/ A simple, accessible GUI that allows the modification of any preference set within the browser environment.
	Add-ons Mirror - http://forum.addonsmirror.net/ Formerly known as The Extensions Mirror. Forum featuring information about a variety of extensions.
	Locationbar² - http://en.design-noir.de/mozilla/locationbar2/ Puts emphasis on the domain and decodes URLs for better readability.
	FaviconizeTab - https://addons.mozilla.org/firefox/3780 The width of the specified tab becomes small up to the size of favicon.
	Mouse Gestures - Optimoz - http://optimoz.mozdev.org/gestures/ Execute commands without using the keyboard, menus or toolbars. Instead, the user holds down a mouse button (usually the right one), moves the mouse in a certain way to form a gesture, then releases the mouse button.

	Interclue - http://interclue.com/ Provides a content summary of a webpage when hovering over a link. Including statistics, metadata, sizes and other relevant information.
	Wikipedia Toolbar - http://wikipedia.mozdev.org/ The Wikipedia extension makes editing of Wikipedia pages easier by adding a new toolbar.
	Sogame Extensions - http://sogame.awardspace.com/ Developer site including the extensions: Define, Dummy Lipsum, Extension List Dumper, NewTabURL, searchOnTab, Tab To Window, TimeStamp Converter and withAttach.
	Accessibar - http://accessibar.mozdev.org/ Provides various accessibility features such as changing the appearance of web pages, including zoom and color changes, and an integrated text to speech reader.
	iMacros for Firefox - http://www.iopus.com/imacros/firefox/ A tool that enables automation of tasks with Firefox.

	Link Widgets - https://addons.mozilla.org/firefox/2933 Eases navigation within sequences of pages by providing toolbar buttons for the first, previous, next, and last page.
	Firefox Showcase - http://showcase.uworks.net/ Shows tabs as thumbnails, to preview, manage and search across them.
	ChromaTabs - http://labs.mozilla.com/2006/11/chromatabs/ Tints browser tabs with a color specific to the website loaded.
	ScreenGrab! - http://www.screengrab.org/ Save or copy the current page, viewport or selection in a png file.
	Gorgias' Firefox Extensions - http://gorgias.de/mfe/ A list of Gorgias' Firefox Extensions including: Send To, Permit Cookies, Add Bookmark Here, Focus Last Selected Tab and Tabwarning.

	XHTML-MP - http://xhtmlmp.mozdev.org/ Allows render HTML content with the mime-type of application/vnd.wap.xhtml+xml.
	Autohide - http://www.krickelkrackel.de/autohide/autohide.htm Autohides the toolbars to make a full fullscreen.
	Text Formating Toolbar - http://codefisher.org/format_toolbar/ Allows easy formatting of posts on forums, weblog comments and wikis.
	Tab Mix Plus - http://tmp.garyr.net/ Enhances Firefox's tab browsing capabilities with lots of options.
	Clippings - http://clippings.mozdev.org/ Saves and manages frequently-entered text for later pasting into forms and input fields.

	Memotoo.com for Firefox - http://memotoofirefox.mozdev.org Allows to synchronize bookmarks with Memotoo.com and use the Memotoo sidebar and toolbar in Firefox.
	Torbutton - http://www.freehaven.net/~squires/torbutton/ Allows the user to easily enable or disable the browser's use of Tor, which stands for "the Onion Router", a system providing strong anonymity. Also works with Thunderbird.
	SpiderZilla - http://spiderzilla.mozdev.org/ Allows to download an entire website from the Internet to a local directory, copying recursively the structure and all the content.
	Long Titles - http://home.etu.unige.ch/~robin0/LongTitles_en.html Prevent long tooltips from being cropped by displaying them on several lines.
	Hattrick Livefox - http://hattricklivefox.mozdev.org/ Lets you watch live games of the Hattrick online football game.

	BlogThis - http://weblog.philringnalda.com/2004/09/17/updated-right-click-blogthis-for-firefox-and-mozilla Adds right-click access to Blogger's BlogThis popup.
	MR Tech Local Install - http://www.mrtech.com/ Provide several tools to install and manage extensions and themes locally.
	Minkaku - http://minkaku.goga.co.jp/ Shows you which Firefox Extension is most used. By installing Minkaku you will be able to vote for your installed extensions. Allows searches on database and provides an API.
	Linkification - http://yellow5.us/firefox/linkification/ Converts text links into clickable links.
	Scribe - http://prismicspiral.com/scribe/ Extension that adds Word Processor like functionality to web forms, including opening and saving form entries as files.

	OpenBook - http://www.chuonthis.com/extensions/openbook.php This extension allows for customization of the Add Bookmark dialog. The bookmarks tree can be automatically opened and elements can be hidden. The entire dialog can even be bypassed.
	SwitchProxy - http://mozmonkey.com/switchproxy/ Switch between multiple proxy configurations quickly and easily.
	MultiSidebar - https://addons.mozilla.org/firefox/4534 Use multiple sidebars simultaneously.
	SubmitToTab - http://dragtotab.mozdev.org/submittotab/ Direct the submission of a form to a new tab.
	MozLab - http://hyperstruct.net/projects/mozlab A set of tools and libraries for developers of AJAX and Mozilla applications, packaged as an extension.

	BookmarkDD - http://bookmarkdd.mozdev.org/ It notices when duplicate bookmark is added.
	Tabinta - http://tabinta.mozdev.org/ Lets insert tab characters in multi-line text input fields.
	Copy URL + - http://copyurlplus.mozdev.org/ Copy to the clipboard the current document's address with additional information.
	AddArt - http://www.addart.eyebeam.org/ Replaces advertising images on web pages with art images from a curated database.
	deskCut - http://deskcut.mozdev.org/ This extension adds desktop shortcut creation to the context-menu. Both Windows and Linux (KDE/GNOME) desktop shortcuts are supported.

	X-Ray - http://www.designmeme.com/xray/ Shows the tags on a page without viewing the sourcecode.
	Fission - http://mozilla.zeniko.ch/fission.html Combines address bar and progress bar, like Safari.
	Quitomzilla - http://www.quitometro.org/quitomzilla_en.php An extension that aims to help you quit cigarettes while you surf the web or wait for new email.
	Firesomething - http://www.cosmicat.com/extensions/firesomething/ An extension for Mozilla Firefox to change the name in the title-bar and other places randomly.
	Paste and Go 2 - http://pasteandgo2.mozdev.org/ Useful paste and go, paste and search added to search and location bar context menu.

	Captain Caveman - http://www.captaincaveman.nl/ Personal website of Martijn Kooij, developer of Web Search Pro, PONG! Multiplayer, Grocery List Generator, Quick Locale Switcher and others extensions. Include a forum, news and scores of Football DEV 3 Doorn.
	Split Browser - http://piro.sakura.ne.jp/xul/_splitbrowser.html.en Splits the content area of the browser window as you like. Status of split browsers are saved, and automatically restored on the next startup.
	Migemo - http://piro.sakura.ne.jp/xul/_xulmigemo.html.en Provides a feature to find Japanese terms in roman-letter spelling.
	Rikaichan - http://www.polarcloud.com/rikaichan Japanese to English/German/French/Russian dictionary. Automatically de-inflects verbs and adjectives.
	Tree Style Tab - http://piro.sakura.ne.jp/xul/_treestyletab.html.en This provides tree-style tab bar, like a folder tree of Windows Explorer. New tabs opened from links are automatically attached to the parent tab. If you often use many many tabs, it will help your web browsing because you can understand relations of tabs.

	CuteMenus - http://cute.mozdev.org/ Adds icons to the most menu-items in pop-ups and menus.
	Arantius - TinyMenu - http://trac.arantius.com/wiki/Extensions/TinyMenu It merge selected menus for the main menubar into a single menu.
	CookieSwap - http://cookieswap.mozdev.org/ Maintain multiple cookie profiles and switch between them on the fly.
	Multiple Tab Handler - http://piro.sakura.ne.jp/xul/_multipletab.html.en Adds the ability of select multiples tabs at once by dragging the mouse. Features close, reload, bookmark, duplicate tabs or copy URIs commands.
	Web Panel Enhancer - http://editcss.mozdev.org/indexwpe.html Add a contextual items related to webpanels and other panel functions.

	Titlebar Tweaks - http://www.cosmicat.com/extensions/titletweak/ Tweak browser's titlebar text.
	Organize Status Bar - http://yellow5.us/firefox/osb/ Add the ability of organize the statusbar icons.
	Bookmarks Synchronizer - https://addons.mozilla.org/firefox/2367/ Bookmarks Synchronizer is a Mozilla Firefox extension that allows to synchronize bookmarks via an FTP server.
	YesScript - https://addons.mozilla.org/en-US/firefox/addon/4922 Allows blacklist JavaScript from defined domains.
	AnyKey - http://anykey.mozdev.org/ Allows typing into phonetic Russian, Ukrainian, Amharic and others, transforming translit into the chosen language.

	NoScript - http://noscript.net/ Blocks all scripts on a page unless it is from a site whitelisted by the user.
	Save File to - http://savefileto.mozdev.org/ Save files to user-defined folders and their sub-folders straight from context menu without opening the save dialog.
	Menu Manipulator - http://forums.mozillazine.org/viewtopic.php?t=272717 Allows you to move, edit, or create new <menu>, <menuitem>, and <menuseparator> elements within a <menubar>, <popup>, or the <tabbrowser>s context menu.
	LiveClick - http://liveclick.mozdev.org/ Enhance Live Bookmarks with links to home pages, favicons, notifications and other feed reading features.
	Development Resources & Extensions - http://www.extensiondevelopment.org/ Extensions directory and resources for extension developers.

	CookiePie - http://www.nektra.com/oss/firefox/extensions/cookiepie/ Enables maintaining different cookies storage in different tabs and windows.
	LastTab - http://timothyhumphrey.name/firefox/lasttab.aspx Allows tab navigation in a most recently used manner.
	FavLoc - http://favloc.fligtar.com/ Saves links and images from the context menu to user-defined folders.
	Statusbar Clock - http://www.cosmicat.com/extensions/timestatus/ Display the date and time in browser's status bar.
	Tab Kit - http://jomel.me.uk/software/firefox/tabkit/ Makes tabs more efficient for power users, bringing tab grouping, and tweaks such as multiple rows of tabs or displaying tabs as a tree.

	All-In-One Sidebar - http://firefox.exxile.net/aios/ Helps view dialog windows such as downloads, extensions, and view source or websites in the sidebar.
	How'd I Get Here - https://www.squarefree.com/extensions/high/ Redirects you to the page on which you first clicked a link to the current page.
	Master Password Timeout - http://www.jetr.com/master_password_timeout/ Locks the master security device after a predefined period of inactivity (timeout).
	userChrome.js - http://mozilla.zeniko.ch/userchrome.js.html Run Javascript like an extension without building a new one.
	Font Finder - http://www.bendodson.com/extensions/fontfinder/ Displays relevant CSS styling (font-family, color, font-size, etc) for any selected text.

	Split Pannel - https://addons.mozilla.org/en-US/firefox/addon/3275 Open panel to left, bottom or right (left, middle, right click) with current URL from Split on context menu.
	External IP - http://www.ermodev.se/visa_firefoxExtensions.htm Allows users to quickly obtain their local public IP address.
	ShowIP - http://l4x.org/frontpage/showip Show and query the current IP Address in the statusbar.
	XPather - http://xpath.alephzarro.com/ Generates XPaths while browsing or inspecting HTML/XML/*ML documents, evaluates XPaths, inspects the results and extracts the content.
	Browser Uptime - http://www.cosmicat.com/extensions/uptime/ Report the duration of your current browser session.

	Bookmarks LinkChecker - https://addons.mozilla.org/firefox/1647 Detects updated, redirected and broken links in bookmarks list by adding icons within the drop-down bookmarks menu.
	BBComposer - http://bbcomposer.elitwork.com/home.html Universal WYSIWYG editor for Firefox, allows edit textareas in those languages: XHTML/CSS, BBCode, Mediawiki, HTML and XBBCode.
	FirefoxADM - http://firefoxadm.sourceforge.net/ Way of editing centrally managed locked and/or default settings in Firefox via Group Policy and Administrative Templates in Microsoft's Active Directory.
	Adaptive Referer Remover - http://misccs.dyndns.org/index.php?Adaptive%20Referer%20Remover Blocks referrer URLs from being sent by headers using regular expressions.
	TabSearch - http://www.semicomplete.com/projects/firefox-tabsearch/ Type keywords, and only the matching tabs will remain showing.

	Tabs Menu - http://mikelward.com/software/firefox/tabs-menu Adds a Tabs menu to the main menu that lets you easily change between open tabs.
	Smiley Xtra - http://www.smileyxtra.co.uk Insert smilies from an online database into forum posts, and weblogs.
	POTO Firefox Extensions - http://leon-huang.com/nu/poto.php Home of the POTO Sidebar extension for Firefox.
	SiaC - Share-in-a-Click - http://www.shareinaclick.com/ Share websites you like with your friends, with a click on a toolbar button.
	Link Alert - http://linkalert.googlepages.com/ Changes the cursor to indicate the type and target of a link.

	ProxyTex Firefox Extension - http://www.idefense.be/firefox/ Allows management of all proxy settings through a simple click on a button.
	Sort Tabs By ... - http://codeoptimism.net/blog/post/2007/08/sorttabsby-firefox-extension.aspx Sorts your tabs by domain/host name or last browsed date, immediately upon navigating to a different URL.
	Highlander - http://tech.einaregilsson.com/projects/highlander/ Avoids tab duplication by focusing URLs that are already open in another tab.
	Bookmarks Full Titles - http://gkn.interbrainz.com/bookmarksfulltitles/ Shows bookmarks full titles in the bookmarks menu and submenus.
	PsicoTSI Tool - http://www.aldeaglobal.net/psicotsi/ Tool for the on-line game Hattrick. Predicts skill sub-levels using TSI.

	Cusser - http://cusser.net/extensions/ Ben Basson's extensions, including Context Highlight, Context Search, Foobar Controls, Image Toolbar, New Tab Homepage and Paste Quote.
	Tab Click Options - http://twanno.mozdev.org/tabclicking/ Let's you select an action to perform with different clicking events on the tab bar or a tab
	Router Status - http://www.undermined.org/projects/view/5 Allows you to control and view the status of your router. Also blocks Internet sites from accessing to the Intranet.
	Tamil Key - https://addons.mozilla.org/firefox/2994 A utility for typing in Tamil language.
	User Agent Switcher - http://chrispederick.com/work/user-agent-switcher/ Adds a menu to switch the user agent of the browser.

	Roachfiend.com - How to create Firefox extensions - http://roachfiend.com/archives/2004/12/08/how-to-create-firefox-extensions Long tutorial.
	Tab History - http://www.penguinus.com/dev/tab_history/ Links opened in a new tab retain their session history, cloning the backward history of the tab to all tabs it opens.
	iComment - http://www.icomment.com/ An extension that allows users to share comments directly on any web page with other iComment users.
	Autocomplete Manager - http://www.leogas.net/acmanager/ Provides advanced features for the address Autocomplete component in Firefox.
	Server Spy - http://jacquetc.free.fr/mozilla/exts/ServerSpy/ Displays the brand of web servers in the status-bar.

	FireGPG - http://firegpg.tuxfamily.org/ Brings an interface to encrypt, decrypt, sign or verify the signature of text using GnuPG.
	Send Tab URLs - http://aecreations.mozdev.org/sendtabs/ Emails the URIs of all browser tabs.
	Javascript Command - https://addons.mozilla.org/en-US/firefox/addon/5058 Tools for writing/testing javascript on Firefox windows, web pages, and bookmarklets. [Require Login]
	/Find Bar/ - http://www.oxymoronical.com/web/firefox/FindBarRX Adds Regular Expressions to the find bar.
	ErrorZilla - http://www.jaybaldwin.com/News.aspx?id=51 Adds an image to the error page for down domains with helpful buttons.

UserStyles : Stylish - http://userstyles.org/
Allow users to create and share custom styles for websites and user interface of Mozilla applications. Includes a collection of customized user styles and a forum.

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