100+ Best Firefox Addons, Extensions and Plugins for Web Designers & Developers

Firefox is a free and open source web browser and most popular among Web Designers and Developers. Which are the most popular firefox addons and extensions? Here is an attempt to collect the 50 popular and best firefox extensions which make your browsing, downloading and navigation in Firefox as easy as possible, while harnessing the full power and features of Firefox.

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Control Powerful Browsing

• Adblock Plus – It is one of the important firefox addon that blocks advertisements to appear on any webpage.
• Aging Tabs – Makes unused tabs fade with age and highlights the selected tab.
• All-in-One Sidebar – Sidebar control with award-winning user experience.
• Auto Copy – Copies selected text to the clipboard automatically. Like Linux or mIrc.
• AutoPager – AutoPager is a firefox/mozilla extension that autoloads the next page in background.
• Better GCal – Enhances Google Calendar with a compilation of user scripts and styles. All scripts copyright their original authors. Click on the script homepage in the Help tab for more information.
• Better Gmail 2 – Enhances Gmail with a compilation of useful features written by Greasemonkey user script developers. All scripts copyright their original authors. Click on the script homepage in the Help tab for more information.
• Better YouTube – A compilation of useful Greasemonkey user scripts for YouTube. All scripts copyright their original authors. Click on the script homepage in the Help tab for more information.
• ColorZilla – Advanced Eyedropper, ColorPicker, Page Zoomer and other colorful goodies
• Cooliris – Cooliris (formerly PicLens) transforms your browser into a full-screen 3D Wall for searching, viewing and sharing the Web.
• CustomizeGoogle – Enhance Google search results and remove ads and spam.
• Delicious Bookmarks – Access your bookmarks wherever you go and keep them organized no matter how many you have.
• DownloadHelper – Download videos and images from many sites. It is the best tool to download videos from YouTube etc .
• FEBE – Backup your Firefox data
• Fire.fm – Get your daily music fix from Last.fm.
• Firefox Universal Uploader (fireuploader) – Provides an user friendly interface to upload files to various websites eg. Box.net, Flickr, Youtube, Picasa, Facebook
• FireFTP – FTP Client for Mozilla Firefox.
• FlashGot – Enables single and massive (”all” and “selection”) downloads using the most popular external download managers for Windows, Mac OS X, Linux and FreeBSD.
• FoxClocks – Displays local times around the world in the statusbar/toolbar. Supports virtually all time zones.
• FoxyProxy – FoxyProxy – Premier proxy management for Firefox
• FoxyTunes – Control any media player from Firefox and more…
• gDocsBar – Perfect companion for Google Docs.
• Gmail Manager – Gmail accounts management and new mail notifications.
• GmailSpace -Use your Gmail account space for file storage. Enables uploading/downloading of folders.
• GooglePreview – Inserts web site previews in Google and Yahoo search results.
• Greasemonkey – A User Script Manager for Firefox
• IE Tab – Enables you to use the embedded IE engine within Mozilla/Firefox.
• Master Password Timeout – Locks the master security device after a predefined period of inactivity
• NoScript – Extra protection for your Firefox: NoScript allows JavaScript, Java (and other plugins) only for trusted domains of your choice (e.g. your home-banking web site).
• Password Exporter – Export and import the saved passwords.
• PC Sync 2 Synchronisation Extension – Enables PC Sync 2 synchronization support.
• PDF Download – Allows you to choose what to do with a PDF file: download it, view it with an external viewer or view it as HTML.
• Perspectives – A secure way to verify encrypted websites and bypass security warnings
• ProfileSwitcher – Adds profile name to status bar tooltip and options to launch other profiles
• Read it Later – Save pages to read later, then bookmark.
• ScrapBook – Helps you to save Web pages and organize the collection.
• Screen grab! – Saves a web-page as an image.
• ScribeFire – A full-featured blog editor that integrates with your browser and lets you easily post to your blog.
• Twitbin – Twitbin is a tool that allows you to interact with your twitter friends and followers right from your browser sidebar.
• Yahoo! Mail Notifier – This extension notifies you when new messages arrive in your Yahoo mailbox.
• Flashblock – The plugin blocks flash from running. It acts on all sites by default, but lets you set ‘whitelists’ of sites that can use flash, such as youtube. For blocked sites (those not on the whitelise) you get a window of the right size on the screen, and a ‘play’ button you can click if you want to load the animation. Here is an opera version.
• Fasterfox – A bunch of tweaks to speed up firefox simply without manually tuning the registry parameters. Can be set to exceed the RFC specs if you want. Also provides a page load timer in the bottom right which is I like. See how much of a change you get after installing flashblock
• Autocomplete Manager – When you type into the default firefox location bar, you get ‘autocomplete’ suggestions based on the part of the URL you typed. This plugin enhances that so it automatically searches on bookmarks, and even web page titles from your history. If you keep a long enough history, it could almost render your bookmarks obsolete.
• Firebug – Essential for anyone who does web development. Install it, then for a page you want to analyze click Tools/Firebug. Click ‘inspect’ and point your mouse at any part of a web page and it’ll show a breakdown of the HTML in that section only, and let you modify the source ‘live’ to test fixes. Great for showing how web pages are composed, and it’s a much nicer alternative to a full ‘view page source’ option. Firebug and the inspect facility can be added as icons to your toolbar, so it doesn’t clutter up your browser out of the box. There is also a YSlow plugin that you can add after installing firebug to perform performance analysis on web pages.
• FoxEar – Essential internal tool that gives you a sidebar to interface into DogEar.
• Fast Video Download – It downloads videos from YouTube. You get an icon in the bottom right that you click when you’re on a page with embedded video, and it lets you save it.
• Remove It Permanently – (RIP) RIP lets you right click on any section of a web page (Such as a sidebar or advert) and specify that it’s removed from all futuring rendering of the page. By using this carefully you can reclaim a lot of your browser screen area.
• PDF Download – helps download the PDF documents
• Down Them All! – a download manager for resume / split into parts / etc
• Foxsaver – A screensaver for your Firefox.

Control Firefox Tabs

• All-in-One Gestures – merges the popular following extensions for management of mouse gestures, scrolling and power navigation. (Mix of Mouse Gestures, Rocker navigation, Tab scroller, History scroller, Link tooltip and Autoscrolling extensions)
• Tabbrowser Preferences – a comprehensive UI for changing a number of the hidden tabbed browsing preferences in Firefox. It also provides the ability to control how internal and external links are opened in the browser and how the browser will react when links are sent to it.
• Tab Mix Plus – More tweaks added to tabs. Ability to select and open muliple links in tabs, open link in a duplicated tab, merge tabs and close tabs from similar domain…
• Colorful Tabs – Colors every tab in a different color and makes them easy to distinguish while beautifying the overall appeal of the interface.
• Viamatic foXpose – Click on the icon in the status bar to view all the browser windows with a single click.
• Firefox Showcase – easily locate and select any open browser window in Firefox.
• Separe – Helps you keeping tabs tidy by introducing a new kind of tab.
• Permatabs – turn tabs of your choice into permanent tabs that can’t be closed, and stick around between sessions.
• FaviconizeTab – resizes the width of the tab to display the favicon only (and back again).
• Undo Closed Tabs – allows you to undo closed tabs via a toolbar and/or tab bar button or the right-click context menu.

Control Website Links

• Linky – Lets you open or download all or selected links, image links and even web addresses found in the text in separate or different tabs or windows.
• Linkification – Allows Firefox to view plain-text URLs and e-mail addresses as actual links
• IE Tab – can open the current page or a selected link embedding Internet Explorer in tabs of Mozilla/Firefox. Very useful for those IE only pages.
• FirefoxView – Open Firefox with the current page or a selected link displayed in Internet Explorer. Adds “View in Firefox” menu items to the content and link context menus.
• Paste and Go – lets you paste an URL from the clipboard into the address bar and load it as a single step, either via the adress bar’s context menu or by pressing Ctrl-Shift-V
• ErrorZilla – changes the default 404 error page with following choices: a google cache, an archival snapshot from the wayback machine, a ping, a trace route, and a whois lookup.
• Hyperwords -� Interact with all the words on the web, not just links!

Control File Downloads

• FlashGot – handles single and massive downloads with several external Download Managers.
• PDF Download – Every time you click on a link, checks if the target is a pdf file and in this case let you choose what you want to do (open pdf file inside a new tab, download it to the filesystem or view it as HTML).
• ScrapBook – helps you to save Web pages and easily manage collections.
• DownThemAll! – adds new advanced downloading capabilities to your browser. It lets you download in just one click all the links or images contained in a webpage or refine your preferences using fully customizable filters.
• Video DownloadHelper – The easy way to download Web videos from hundreds of YouTube-like sites, audio and picture galleries.
• TargetAlert – provides visual cues for the destinations of hyperlinks in cases of pdf, doc, zip files etc.
• Download Manager Tweak – modifies the default appearance of the firefox download manager and allows it to be opened in a separate window, the sidebar, or a tab.
• Download Statusbar – is a browser extension that allows you to keep track of ongoing and completed downloads in a hide-away statusbar
• Disable Targets For Downloads – Prevents sites spawning blank windows when clicking binary downloads.
• FireFTP – is a free, secure, cross-platform FTP client for Mozilla Firefox which provides easy and intuitive access to FTP servers.
• Open IT Online – allows you to open your documents and images online without the need of any software to be installed.

Control Webpage Behaviour and Navigation

• GreaseMonkey – Install user scripts and change the behavior of any web page
• Image Zoom – Right click on an image and select a zoom option from the popup menu, or, hold down the right mouse button in combination with the mouse wheel to zoom in or out on an image.
• Fasterfox – Speeds up Firefox by recycling idle bandwidth by silently prefetching and caching all of the links on the page you are browsing. (Some readers said it actually slowed down their firefox – verify yourself)
• SpellBound – enables spell checking in web forms such as html textarea / input elements (html input password elements are not checked by SpellBound) and rich text form elements. This allows you to spell check forms before submitting them.
• Taboo – lets you save a page for later (taking a screenshot, and using the Session Saver code to remember scroll location and form fields).
• BugMeNot – Bypasses compulsory web registration using the BugMeNot without the hassle of surfing to it and querying its database everytime.
• AutoCopy – Select text on any web page and it will be automatically copied to the clipboard. Middle click to Paste.
• Copy Plain Text – Copies text without formatting.
• Google Images Re-Linker – This will let you click the thumbnail images on images.google.com, skip the referred framed page, and jump straight to the full-size image.
• Extended Statusbar – adds an Opera-like statusbar for Firefox that shows number of loaded images, bytes downloaded, average download speed, load time and percentage of the page loaded.
• Adblock Plus – is an enhanced version of Adblock. Block ads, applets, flash, embedded-media etc.
• Flashblock – blocks all Flash content from loading on a webpage.
• Sage-Too – add a lightweight RSS and Atom feed aggregator which integrates with Firefox’s bookmark storage and Live Bookmarks.
• Pearl Crescent Page Saver – capture screenshots and save full webpages as images easily.
• Reload Every – adds an option to the context menu to reload the web page you are viewing every so many seconds or minutes. Useful if you keep refreshing some pages often.
• InFormEnter – adds a small, clickable icon next to every input field in a web form, from where you can select the item to be inserted with your frequently used information such as name, email, address and whatever else you want to be available from the form menu.
• All-in-One Sidebar – is a sidebar control, inspired by Opera that lets you quickly switch between sidebars, view dialog windows such as downloads, extensions, and more in the sidebar, or view source code or websites in the sidebar. Can be extensively customized.
• Text size toolbar – Adds buttons to increase or decrease text size or restore default size easily. Useful for those small unreadable font sizes.
• Reveal – allows you to see thumbnails of pages in your session history and quickly find the page you want.
• Mystickies – allows you to place sticky notes all over the web and organize them with tags.
• Clear Cache Button – Adds a clear cache toolbar button that cleans the cache in one click. Very handy for those who have use for it.
• gTranslate – translate any text in a webpage just by selecting and right-clicking over it. Uses the Google translation services.
• Xinha Here! – is a wrapper for the Xinha HTML editor that enables WYSIWYG editing in any textarea and text box on any website.
• Yoono – instantly suggests alternate sites and people who share the same interests while you are surfing.
• BlueOrganizer – It helps you personalize your web experience based on what you already like, helping you discover relevant new information and save time.
• PicLens – transforms your browser into a visually stunning experience for finding and viewing online photos and videos.
• Feed Sidebar – displays the items from your Live Bookmarks in the sidebar.

Control Privacy / Security

• FoxyProxy is an advanced proxy management tool that completely replaces Firefox’s limited proxying capabilities.
• NoScript – allows JavaScript, Java (and other plugins) only for trusted domains of your choice. This whitelist based pre-emptive blocking approach prevents exploitation of security vulnerabilities with no loss of functionality
• CookieCuller – Extended Cookie Manager to protect/unprotect selected cookies.
• Stealther – surf the web without leaving a trace in your local computer by *temporarily disabling history (and address bar), cookies, formFill, disk cache and sending of ReferrerHeader. Verify details of what exactly it can work for you.
• Glubble Family Edition – is a free parental control suite for Firefox.
• Password Exporter – allows you to export your saved passwords and disabled login hosts using XML or CSV files that can be imported in another browser or computer.

Control Web Searches

• Google Toolbar for Firefox – Lets you search google and all its services easily. Also powered by Google Suggest (Get query suggestions as you type in the search box), SpellCheck, AutoFill, Pagerank of webpage, access to gmail, WordTranslator etc.
• CustomizeGoogle – enhances Google search results by adding extra information (like links to Yahoo, Ask Jeeves, MSN etc) and removing unwanted information (like ads and spam).
• NextPlease! – allows you to assign keyboard shortcuts to jump to next and previous links on search results pages, like Google, Yahoo, Ebay, Amazon, and many other sites.
• BetterSearch – enhances Google, MSN Search, Yahoo Search, A9, Answers.com, AllTheWeb, Dogpile.com, del.icio.us and Simpy.com bookmarks by adding previews (thumbnails) and Amazon product images and info etc.
• Answers – Press Alt (or Option on a Mac) and click any word to get a quick, relevant definition or explanation, drawn from a collection of over 100 reference titles.

Control Your Music / Video

• FoxyTunes – Listen to music while surfing the Web, and control your favorite media player without ever leaving the browser.
• MediaPlayerConnectivity – Allow you to launch embed video of website in an external application with a simple click

Control Your Email

• Better Gmail 2 – a compilation of Greasemonkey user scripts that adds advanced� features to new version of Gmail.
• Gmail Manager – 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.
• WebMail Notifier – checks your webmail accounts and notifies the number of unread emails. Supports gmail, yahoo, hotmail etc.

Control Your Bookmarks

• Bookmark with Del.icio.us – Integrate del.icio.us right into Firefox. Easily access your bookmarks and post new bookmarks. Post a bookmark without leaving the page you are on.
• Foxmarks Bookmark Synchronizer – Install Foxmarks on each computer, and it will work silently in the background to keep your bookmarks synchronized
• StumbleUpon – is an intelligent browsing tool for sharing and discovering great websites.
• Reliby – provides you with Reload all Live Bookmarks functionality.
• Clipmarks – lets you save and share Web page content without having to bookmark the entire page.
• Shareaholic – Share, bookmark and e-mail web pages quickly without leaving your browser.

Control Other Popular Services

• Digg Toolbar – Displays Digg counts & comments as you browse around the web. You can also Digg and submit stories directly from the toolbar
• Adsense Notifier – Displays your Adsense earnings on the statusbar.
• Forecastfox Enhanced – Get international weather forecasts and display it in any toolbar or statusbar. Now with improved radar images and allows for pausing, restarting and setting the frequency of automatic updates.
• DictionarySearch – Looks up a user selected word in an online dictionary you selected.
• Web Developer – Adds a menu and a toolbar with various essential web developer tools.
• Scribefire – A full featured blog editor that sits right within Firefox and lets you easily post to your WordPress, MovableType or Blogger blogs.
• Map+ – enables you to quickly view a map of a selected address in Firefox without changing windows or tabs.
• ChatZilla – is a clean and easy to use Internet relay chat (IRC) client.
• TwitterFox – notifies you of your friends’ tweets of Twitter.