Extensions are small add-ons that add new functionality to Firefox. They can add anything from a toolbar button to a completely new feature. They allow the browser to be customized to fit the personal needs of each user if they need additional features, while keeping Firefox small to download.
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- CuteMenus Adds icons to the most menu-items in pop-ups and menus.
- Mouse Gestures - Optimoz 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.
- Preferential A simple, accessible GUI that allows the modification of any preference set within the browser environment.
- ReloadEvery Automatically reloads a web page every so many seconds or minutes.
- Wikipedia Toolbar The Wikipedia extension makes editing of Wikipedia pages easier by adding a new toolbar.
- FireMath A Firefox browser extension for WYSIWYG MathML editing. Site includes installation instructions, usage examples, FAQ, a discussion forum and links to resources.
- ChatZilla A simple, straightforward Internet Relay Chat (IRC) client.
- AutoCopy Transfers text to the clipboard as soon as it's highlighted.
- Copy URL + Copy to the clipboard the current document's address with additional information.
- LiveHTTPHeaders Adds various functions for handling HTTP Headers.
- RefSpoof Allows users to load pages with a modified referrer.
- Health On the Net (HON) A collection of Firefox plugins to support the Health On the Net foundation.
- Web Panel Enhancer Add a contextual items related to webpanels and other panel functions.
- Deepest Sender Post to LiveJournal (and LiveJournal based sites) directly from Firefox.
- deskCut This extension adds desktop shortcut creation to the context-menu. Both Windows and Linux (KDE/GNOME) desktop shortcuts are supported.
- Smiley Xtra Insert smilies from an online database into forum posts, and weblogs.
- InFormEnter Extension for Mozilla Firefox for form filling in semi-automatic mode.
- WMLbrowser Simulates WAP browsing by viewing WML (Wireless Markup Language) pages in Mozilla Suite, SeaMonkey or Firefox.
- Fasterfox Performance and network tweaks for Firefox.
- Adblock Plus Blocks advertising, banners and other unwanted stuff on websites.
- BBComposer Universal WYSIWYG editor for Firefox, allows edit textareas in those languages: XHTML/CSS, BBCode, Mediawiki, HTML and XBBCode.
- Locationbar² Puts emphasis on the domain and decodes URLs for better readability.
- Flashblock Blocks all Flash content in a web page from loading automatically and allows selective activation and whitelisting of sites.
- NoScript Blocks all scripts on a page unless it is from a site whitelisted by the user.
- FireFTP A free, secure, cross-platform FTP client.
- Tabinta Lets insert tab characters in multi-line text input fields.
- User Agent Switcher Adds a menu to switch the user agent of the browser.
- All-In-One Sidebar Helps view dialog windows such as downloads, extensions, and view source or websites in the sidebar.
- CookieSwap Maintain multiple cookie profiles and switch between them on the fly.
- Menu Editor Allows you to customize the menus in Firefox and Thunderbird.
- YesScript Allows blacklist JavaScript from defined domains.
- Menu Manipulator Allows you to move, edit, or create new <menu>, <menuitem>, and <menuseparator> elements within a <menubar>, <popup>, or the <tabbrowser>s context menu.
- Clippings Saves and manages frequently-entered text for later pasting into forms and input fields.
- XHTML-MP Allows render HTML content with the mime-type of application/vnd.wap.xhtml+xml.
- Send Tab URLs Emails the URIs of all browser tabs.
- Fission Combines address bar and progress bar, like Safari.
- Hattrick Livefox Lets you watch live games of the Hattrick online football game.
- PsicoTSI Tool Tool for the on-line game Hattrick. Predicts skill sub-levels using TSI.
- Text Formatting Toolbar Allows easy formatting of posts on forums, weblog comments and wikis.
- httpfox Monitors and analyses all incoming and outgoing HTTP traffic between the browser and the web servers.
- Server Spy Displays the brand of web servers in the status-bar.
- PageUpdateChecker Allows the user to monitor a webpage for updates and track changes.
- Copy Link Text (CoLT) Makes it easy to copy a hyperlink’s associated text and paste it in several different formats, including user defined formats.
- RefControl Controls HTTP referrers on a per receiving site basis.
- AnyColor Allows users to customize the browser's appearance on the fly.
- UserStyles : Stylish 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.
- Mailfrom Enables mailto links to be directed to webmail applications for email composition.
- ArchView It can open and preview archive files on-line ( RAR, ZIP and ISO CD image ) fetching the necessary portions without downloading the whole file.
- Zotero Firefox extension to aid the collection, management, and use of research sources. Details of features, project news, discussion forums, and download.
- Xrl.in Tiny Links Adds a small button to the URL bar, that let's you copy/paste or e-mail a short URL for the page you are visiting.
- ShowIP Show and query the current IP Address in the statusbar.
- ImageTweak Shows single images centered in the window, against a neutral gray background, with zooming options.
- BlogThis Adds right-click access to Blogger's BlogThis popup.
- Identifox Add-on for the open source microblogging service Identi.ca. Shows latest dents and allows for quick denting.
- Ghostery Alerts users about the web bugs, ad networks and widgets on visited web pages. News, screenshots and download.
- WOT Indicates whether site is untrustworthy for the WOT community.
- Update Notifier Notifies you when updates are available for installed extensions and themes. Quick access availability checking.
- WebMail Notifier Checks your webmail accounts and notifies you the number of unread emails. With userscripts for different services.
- Site Launcher Quickly open often used websites using hotkeys.
- SmartFind A Smart way to find a word in a page, by searching for the most similar word.
- userChrome.js Runs JavaScript like an extension without building a new one.
- Grocery List Generator Automatically adds ingredients to your grocery list and shares recipes with the world.
- Firefogg Allows users to encode videos in ogg and webm formats and upload them to compatible sites. Includes documentation and a list of sites supporting this extension.
- The Overbite Project Replaces and enhances Firefox's gopher support with a customizable interface and improved protocol support.
- Fire.fm Gives you access to the extensive music library on Last.fm
- Add-ons for Firefox Official add-ons repository from Mozilla organized by category. Includes themes, plugins and search tools.
- Mafiaa Fire Created as a response to the controversial seizures of domain names by the Department of Homeland Security, this addon redirects seized domains to their new locations. Allows site owners to register their sites and contains a FAQ with background information on the issues.
- Add-on Reviews Provides useful insight on Firefox addons, widgets, and plugins.
- CanImage Opens images from many different sources (webpage images, files, clipboard, screenshots), lets you change them with an image editor and push it to many different places (files, clipboard, file inputs).
- KeeFox Adds free, secure and easy to use password management features to Firefox by connecting Firefox to KeePass Password Safe.
- BestMacros iMacros scripts, bot and macros for Firefox.
- Router Status Allows to control and view the status of routers. Also blocks Internet sites from accessing to the Intranet. Discontinued.
- Latest Version Plugin The site provides details on Firefox plugins, listing the version, details on what they do and download links.
- CookiePie Enables maintaining different cookies storage in different tabs and windows.
- Arantius - TinyMenu It merges selected menus for the main menubar into a single menu.
- Fireshot Makes it possible to take screenshots of entire webpages. Includes editing and annotation tools. The basic version is free.
- Interclue Provides a content summary of a webpage when hovering over a link. Including statistics, metadata, sizes and other relevant information.
- Multifox Allows Firefox to log in to a website with multiple accounts simultaneously.
- Foxreplace Enables replacing text fragments in web pages by defining a substitution list. Substitutions can be applied all at once or individually.
- Cosmic Cat A set of extensions for title and statusbar modification, and one to show the browser session duration.