To use these add-ons, you'll need to download Firefox.

Log in

14,038 extensions found in Web Development

Filter results
Search results
  • Netmirror Extension

    Netmirror Extension

    Add, modify or remove a header for any request.

    Netmirror

    13,406 users

  • Yandex Search

    Yandex Search

    Adds Yandex for search engines

    KDev

    13,357 users

  • SeoQuake SEO extension

    SeoQuake SEO extension

    Accelerate your SEO efforts on the fly. SEOquake is a free plugin for browsers that provides you with key SEO metrics for a specific page, along with other useful tools such as SEO Audit and many others.

    SeoQuake Team

    13,081 users

  • Xdebug Helper for Firefox

    Xdebug Helper for Firefox

    This extension is very useful for PHP developers that are using PHP tools with Xdebug support like PHPStorm, Eclipse with PDT, Netbeans and MacGDBp or any other Xdebug compatible profiling tool like KCacheGrind, WinCacheGrind or Webgrind.

    BrianGilbert_

    12,947 users

  • Text Link

    Text Link

    Allows URI texts written in webpages to be loaded by double clicks.

    Piro (piro_or)

    12,928 users

  • JavaScript Toggle On and Off (WebExtension)

    JavaScript Toggle On and Off (WebExtension)

    Toggle JavaScript engine on and off the easy way

    tlintspr

    12,267 users

  • Header Editor

    Header Editor

    Manage browser's requests, include modify the request headers and response headers, redirect requests, cancel requests

    泷涯

    12,200 users

  • Proxy SwitchyOmega

    Proxy SwitchyOmega

    Manage and switch between multiple proxies quickly & easily.

    Firefox user 12962115

    12,006 users

  • My IP Hider VPN

    My IP Hider VPN

    My IP Hider VPN is number one tool for hiding your IP and unblocking any web site! If your Firefox version is less then 55 please install older My IP Hider VPN from "Version History" (https://goo.gl/7ZQQjZ)

    MyIpHider.com

    11,824 users

  • RESTED

    RESTED

    A REST client for the rest of us

    Eline H

    11,731 users

  • Imageye - Image downloader

    Imageye - Image downloader

    Find and download all images on a web page.

    Meagan Amrach

    11,703 users

  • Fake Filler

    Fake Filler

    A form filler that fills all form inputs (textboxes, textareas, radio buttons, dropdowns, etc.) with fake and randomly generated data. The purpose of this extension is to help developers and testers test forms quickly and easily.

    Hussein

    11,594 users

  • Flag Cookies

    Flag Cookies

    A cookie and browser storage data manager on steroids to mark, 'flag', and manage cookies using rulesets.

    Jan Riechers

    11,419 users

  • javascript

    javascript

    add javascript that will run on this domain. back up your scripts in the options area (shortcut there by clicking the "JS" letters in the bottom right)

    chee

    11,315 users

  • Lightning Autofill

    Lightning Autofill

    The most popular autofill extension, boosting productivity since 2010.

    tohodo.com

    11,195 users

  • PoE Overlay II Sync

    PoE Overlay II Sync

    Sync your Path of Exile 2 website session with PoE Overlay II

    Kyusung4698

    11,191 users

  • Mobile simulator - responsive testing tool

    Mobile simulator - responsive testing tool

    Smartphone and tablet simulator on computer with several models to test mobile responsive websites.

    Mobile FIRST

    10,963 users

  • Save Screenshot

    Save Screenshot

    Saves the current page as image file or copies it to clipboard.

    Manuel Reimer

    10,735 users

  • ScriptCat

    ScriptCat

    Everything can be scripted, allowing your browser to do more!

    王一之

    10,603 users

  • Fonts Ninja - Font Finder & Identifier

    Fonts Ninja - Font Finder & Identifier

    Identify any font on any website in one click. The most accurate font finder - try, bookmark and get fonts as you browse.

    Fonts Ninja

    10,104 users

  • axe DevTools® - Web Accessibility Testing

    axe DevTools® - Web Accessibility Testing

    Add accessibility auditing to the Firefox Developer Tools

    Deque Systems Inc.

    9,788 users

  • JSON Lite

    JSON Lite

    Fast JSON viewer - highlights, shows items count/size, handles large files

    Lauri Rooden

    9,648 users

  • Modify Header Value

    Modify Header Value

    Add, modify or remove a header for any request on desired domains.

    Milen

    9,629 users

  • Empty Cache Button

    Empty Cache Button

    Cache clearing made easy. One click.

    mvm

    9,600 users

  • IP Address and Domain Information

    IP Address and Domain Information

    The Ultimate online investigation tool! See detailed information about every IP Address, Domain Name and Provider.

    webdev7

    9,568 users