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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.
  Google Extensions http://www.google.com/tools/firefox/
Includes the Google Toolbar, Google Browser Sync, Google Notebook and Google send to phone.
  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.
  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.
  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.”
  Health On the Net (HON) http://hon.mozdev.org/
A collection of Firefox plugins to support the Health On the Net foundation.
  DownThemAll http://www.downthemall.net/
Download in just one click all the links or images contained in a web page.
  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.
  Linky http://gemal.dk/mozilla/linky.html
Aims to increase the user's power to handle links in Mozilla.
  LiveHTTPHeaders http://livehttpheaders.mozdev.org/
Adds various functions for handling HTTP Headers.
  Extension Room http://extensionroom.mozdev.org/
Categorized list with details of extensions for Mozilla applications.
  MozBraille http://mozbraille.mozdev.org/
Self-voicing and Braille output based on the Mozilla browser.
  BabelZilla http://www.babelzilla.org/
International community of translators for Mozilla applications. Includes a system to allow online translations, a list of common extensions terms and tutorials for extension localization in many languages.
  FireFTP http://fireftp.mozdev.org/
A free, secure, cross-platform FTP client.
  Flashblock http://flashblock.mozdev.org/
Blocks all Flash content in a web page from loading automatically and allows selective activation and whitelisting of sites.
  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.
  CLiCk, Speak http://clickspeak.clcworld.net/
An open source extension designed for sighted users who want text-to-speech functionality.
  Link Evaluator http://evaluator.oclc.org/
Evaluate the availability of on-line resources.
  wmlbrowser http://wmlbrowser.mozdev.org/
Simulate WAP browsing by viewing WML (Wireless Markup Language) pages in Mozilla Suite, SeaMonkey or Firefox.
  Deepest Sender http://deepestsender.mozdev.org/
Post to LiveJournal (and LiveJournal based sites) directly from Firefox.
  Menu Editor http://menueditor.mozdev.org/
Allows you to customize the menus in Firefox and Thunderbird.
  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.
  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.
  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.
  ReloadEvery http://reloadevery.mozdev.org/
Automatically reloads a web page every so many seconds or minutes.
  Add-ons Mirror http://forum.addonsmirror.net/
Formerly known as The Extensions Mirror. Forum featuring information about a variety of extensions.
  Preferential http://preferential.mozdev.org/
A simple, accessible GUI that allows the modification of any preference set within the browser environment.
  Locationbar² http://en.design-noir.de/mozilla/locationbar2/
Puts emphasis on the domain and decodes URLs for better readability.
  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.
  FaviconizeTab https://addons.mozilla.org/firefox/3780
The width of the specified tab becomes small up to the size of favicon.
  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.
  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.
  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.
  iMacros for Firefox http://www.iopus.com/imacros/firefox/
A tool that enables automation of tasks with Firefox.
  Shareaholic http://shareaholic.com/
An extension to share and bookmark web-pages on popular social sharing and bookmarking services.
  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.
  Autohide http://www.krickelkrackel.de/autohide/autohide.htm
Autohides the toolbars to make a full fullscreen.
  XHTML-MP http://xhtmlmp.mozdev.org/
Allows render HTML content with the mime-type of application/vnd.wap.xhtml+xml.
  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.
  Text Formating Toolbar http://codefisher.org/format_toolbar/
Allows easy formatting of posts on forums, weblog comments and wikis.
  ThumbsDown http://thumbsdown.mozdev.org/
Bulk image downloader. Downloads the original full size images from a page of thumbnails.
  Tab Mix Plus http://tmp.garyr.net/
Enhances Firefox's tab browsing capabilities with lots of options.
  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.
  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.
  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.
  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.
  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.
  Scribe http://prismicspiral.com/scribe/
Extension that adds Word Processor like functionality to web forms, including opening and saving form entries as files.
  Linkification http://yellow5.us/firefox/linkification/
Converts text links into clickable links.
  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.
  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.
  SubmitToTab http://dragtotab.mozdev.org/submittotab/
Direct the submission of a form to a new tab.
  SwitchProxy http://mozmonkey.com/switchproxy/
Switch between multiple proxy configurations quickly and easily.
  MultiSidebar https://addons.mozilla.org/firefox/4534
Use multiple sidebars simultaneously.
  BookmarkDD http://bookmarkdd.mozdev.org/
It notices when duplicate bookmark is added.
  AddArt http://www.addart.eyebeam.org/
Replaces advertising images on web pages with art images from a curated database.
  Copy URL + http://copyurlplus.mozdev.org/
Copy to the clipboard the current document's address with additional information.
  MozLab http://hyperstruct.net/projects/mozlab
A set of tools and libraries for developers of AJAX and Mozilla applications, packaged as an extension.
  Tabinta http://tabinta.mozdev.org/
Lets insert tab characters in multi-line text input fields.
  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.
  X-Ray http://www.designmeme.com/xray/
Shows the tags on a page without viewing the sourcecode.
  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.
  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.
  Secure Login & Autofill Forms https://blueimp.net/mozilla/
Add-ons to fill out web forms automatically and to login with one click or a keyboard shortcut.
  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.
  Web Panel Enhancer http://editcss.mozdev.org/indexwpe.html
Add a contextual items related to webpanels and other panel functions.
  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.
  Rikaichan http://www.polarcloud.com/rikaichan
Japanese to English/German/French/Russian dictionary. Automatically de-inflects verbs and adjectives.
  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.
  Migemo http://piro.sakura.ne.jp/xul/_xulmigemo.html.en
Provides a feature to find Japanese terms in roman-letter spelling.
  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.
  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.
  CuteMenus http://cute.mozdev.org/
Adds icons to the most menu-items in pop-ups and menus.
  Titlebar Tweaks http://www.cosmicat.com/extensions/titletweak/
Tweak browser's titlebar text.
  AnyKey http://anykey.mozdev.org/
Allows typing into phonetic Russian, Ukrainian, Amharic and others, transforming translit into the chosen language.
  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.
  Organize Status Bar http://yellow5.us/firefox/osb/
Add the ability of organize the statusbar icons.
  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.
  Copy Link Text (CoLT) http://www.borngeek.com/firefox/colt/
Makes it easy to copy a hyperlink’s associated text and paste it in several different formats, including user defined formats.
  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.
  Development Resources & Extensions http://www.extensiondevelopment.org/
Extensions directory and resources for extension developers.
  LiveClick http://liveclick.mozdev.org/
Enhance Live Bookmarks with links to home pages, favicons, notifications and other feed reading features.
  CookiePie http://www.nektra.com/oss/firefox/extensions/cookiepie/
Enables maintaining different cookies storage in different tabs and windows.
  Statusbar Clock http://www.cosmicat.com/extensions/timestatus/
Display the date and time in browser's status bar.
  LastTab http://timothyhumphrey.name/firefox/lasttab.aspx
Allows tab navigation in a most recently used manner.
  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.
  FavLoc http://favloc.fligtar.com/
Saves links and images from the context menu to user-defined folders.
  FoxTorrent http://www.foxtorrent.com/
A cross-platform BitTorrent client for Firefox that lets you stream torrents as they download.
  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.
  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.
  PageUpdateChecker http://pageupdatechecker.mozdev.org/
Allows the user to monitor a webpage for updates and track changes.
  Master Password Timeout http://www.jetr.com/master_password_timeout/
Locks the master security device after a predefined period of inactivity (timeout).
  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.
  userChrome.js http://mozilla.zeniko.ch/userchrome.js.html
Run Javascript like an extension without building a new one.
  ShowIP http://l4x.org/frontpage/showip
Show and query the current IP Address in the statusbar.
  Font Finder http://www.bendodson.com/extensions/fontfinder/
Displays relevant CSS styling (font-family, color, font-size, etc) for any selected text.
  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.
  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.
  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.
  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.
  Adaptive Referer Remover http://misccs.dyndns.org/index.php?Adaptive%20Referer%20Remover
Blocks referrer URLs from being sent by headers using regular expressions.
  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.
  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.
  RefControl http://www.stardrifter.org/refcontrol/
Controls HTTP referrers on a per receiving site basis.
  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.
  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.
  ProxyTex Firefox Extension http://www.idefense.be/firefox/
Allows management of all proxy settings through a simple click on a button.
  Highlander http://tech.einaregilsson.com/projects/highlander/
Avoids tab duplication by focusing URLs that are already open in another tab.
  PsicoTSI Tool http://www.aldeaglobal.net/psicotsi/
Tool for the on-line game Hattrick. Predicts skill sub-levels using TSI.
  Bookmarks Full Titles http://gkn.interbrainz.com/bookmarksfulltitles/
Shows bookmarks full titles in the bookmarks menu and submenus.
  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.
  Open in browser extension http://www.spasche.net/mozilla/
Allows view different document types within the browser.
  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.
  RC 's Code Snippets - Firefox & IE - Copy Context Menu Plugin http://ryanscook.com/adminsBlog/2007/02/firefox-ie-copy-context-menus.html
Adds "Copy As Html" and "Copy As Plain Text" to the context menu.
  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.
  Page Zoom http://www.accessfirefox.org/Page_Zoom.php
Ads page zooming buttons and other zooming options.
  iComment http://www.icomment.com/
An extension that allows users to share comments directly on any web page with other iComment users.
  Server Spy http://www.jacquet80.eu/mozilla/exts/ServerSpy/
Displays the brand of web servers in the status-bar.
  Autocomplete Manager http://www.leogas.net/acmanager/
Provides advanced features for the address Autocomplete component in Firefox.
  FireGPG http://firegpg.tuxfamily.org/
Brings an interface to encrypt, decrypt, sign or verify the signature of text using GnuPG.
  httpfox http://code.google.com/p/httpfox/
Monitors and analyses all incoming and outgoing HTTP traffic between the browser and the web servers.
  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]
  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.
  /Find Bar/ http://www.oxymoronical.com/web/firefox/FindBarRX
Adds Regular Expressions to the find bar.

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