Web Development

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  • Firebug

    Web Development
    Rated 5 out of 5 stars (1,755)
    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...
    2,684,042 users
  • The best security you can get in a web browser!
    Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.
    2,329,827 users
  • Adds ClickOnce support and the ability to report installed .NET versions to the web server.
    2,139,098 users
  • Ghostery

    Privacy & Security
    Rated 5 out of 5 stars (1,077)
    Protect your privacy. See who's tracking your web browsing and block them with Ghostery.
    1,453,915 users
  • Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.
    910,554 users
  • Stylish

    Appearance
    Rated 4 out of 5 stars (727)
    Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Orkut, and many, many other sites. You can even customize Firefox and other programs themselves.
    775,272 users
  • Flagfox

    Alerts & Updates
    Rated 5 out of 5 stars (622)
    Displays a country flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, whois, translation, similar sites, validation, URL shortening, and more...
    757,011 users
  • Test Pilot

    Web Development
    Rated 4 out of 5 stars (71)
    Help us make Firefox better by joining our structured user studies! No need to download this add-on if you are running Firefox 4 beta, - you are already a part of the team!
    751,832 users
  • Web Developer

    Web Development
    Rated 5 out of 5 stars (202)
    The Web Developer extension adds various web developer tools to the browser.
    696,422 users
  • FireFTP

    Download Management
    Rated 4 out of 5 stars (904)
    FireFTP is a free, secure, cross-platform FTP/SFTP client for Mozilla Firefox which provides easy and intuitive access to FTP/SFTP servers.

    Check out my new project, FireSSH!
    680,154 users
  • Note: If you are encountering the Connecting... problem see instructions below.

    The updated, fully supported IE Tab. Embed IE in a Firefox tab. IE Tab Features: FF 4+ support, IE 7-9 compatibility modes, old IE Tab settings import.
    664,776 users
  • Remove or manage a new and uncommon kind of cookies, better known as LSO's.The BetterPrivacy safeguard offers various ways to handle Flash-cookies set by Google, YouTube, Ebay and others...

    Latest updates: See bottom link 'version history'!
    645,854 users
  • The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.
    440,172 users
  • FoxyProxy is an advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. For a simpler tool and less advanced configuration options, please use FoxyProxy Basic.
    359,571 users
  • IE Tab

    Tabs
    Rated 4 out of 5 stars (1,183)
    IE Tab - an extension from Taiwan, features: Embedding Internet Explorer in tabs of Mozilla/Firefox...
    339,448 users
  • ColorZilla

    Web Development
    Rated 5 out of 5 stars (300)
    Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
    307,428 users
  • Automate Firefox. Record and replay repetitious work. If you love the Firefox web browser, but are tired of repetitive tasks like visiting the same sites every days, filling out forms, and remembering passwords, then iMacros for Firefox is the soluti...
    301,793 users
  • QuickJava

    Privacy & Security
    Rated 5 out of 5 stars (242)
    Allows quick enable and disable of Java, Javascript, Cookies, Image Animations, Flash, Silverlight, Images, Stylesheets and Proxy from the Toolbar. This is great for increasing security or decreasing bandwidth.
    293,883 users

Top Rated See all »

  • Does everything for an HTML table: Copy (table/row/column/cell), Sort (multi-column), Search (regex, range operations ...), Filter, Chart, Statistics, Rearrange, Combine/Compare. To use: Right click in a real HTML table for the "tabletools2" option.
    20,105 users
  • 'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions on Windows.

    Beta builds on versions page!
    43,360 users
  • Gives you a place to put all your add-on buttons without over-crowding the navigation bar.
    148,331 users
  • Stylish Sync

    Appearance
    Rated 5 out of 5 stars (19)
    Sync engine for Stylish with backup / restore facility.
    6,133 users
  • Inspect the DOM at lightning speed.
    18,637 users
  • The "NewScrollbars"-extension replaces the default scrollbars of Firefox and Thunderbird with colorized ones (partly) known from "Noia themes".

    Firefox 32 zoom bug with custom scrollbars got fixed in Firefox 33 beta 6, Aurora and Nightly!
    15,936 users
  • Mason

    Web Development
    Rated 5 out of 5 stars (63)
    This extension can simplify the rule to just specify the URI and Content type and can enable/disable each rule separately.
    What's more, it can customize the web pages by user scripts which is similar to Grease Monkey.
    8,357 users
  • Color tools for web development.

    Color picker and eyedropper + saving colors and trying out colors with drag and drop.
    43,323 users
  • cliget

    Download Management
    Rated 5 out of 5 stars (43)
    Download files using curl or wget. This addon generates curl/wget commands that emulate the request as though it's coming from your browser allowing you to download protected files directly to a separate machine (e.g. server).
    6,144 users
  • Console²

    Web Development
    Rated 5 out of 5 stars (47)
    Console² (pronounced Console Squared or Console Two) replaces the JavaScript Console with what could be the next generation Error Console. From v0.5 includes the Console Filter extension previously available separately from the Console² website.
    13,417 users
  • QuickJava

    Privacy & Security
    Rated 5 out of 5 stars (242)
    Allows quick enable and disable of Java, Javascript, Cookies, Image Animations, Flash, Silverlight, Images, Stylesheets and Proxy from the Toolbar. This is great for increasing security or decreasing bandwidth.
    293,883 users
  • Rotates complete browser profiles ( from real browsers / devices ) at a user defined time interval. It includes many extra privacy enhancing options
    26,820 users
  • Open Dom Inspector at this node from Inspect on context menu. Dom Inspector must already be installed. Handy for checking both page for web developers and chrome for extension...
    1,733 users
  • This addon predicts your character based on date of birth
    This add on would be added to addon bar above the taskbar with name HCGdora and click on it to open
    93 users
  • Easy and convenient screenshot tool. Allows you to make screenshots of any selected area (video and flash too), edit and upload it to server.
    55,061 users
  • The best security you can get in a web browser!
    Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.
    2,329,827 users
  • CoLT

    Web Development
    Rated 5 out of 5 stars (90)
    CoLT (short for "Copy Link Text") makes it easy to copy either a link's text, or both the link text and its URL in a format you specify. This non-invasive extension simply appears as context menu items when you right-click a link. Fully customizable!
    8,700 users
  • Manage form history entries (search, edit, cleanup, export/import) and easy text formfiller.

    Auto-save text entered in any form while typing to allow fast recovery when disaster strikes.

    Control for which webpage form history is saved or not.
    31,500 users

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