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

Log in

13,040 extensions found in Web Development

Filter results
Search results
  • YouTube Background Play

    YouTube Background Play

    Keep YouTube videos playing when you switch tabs or minimize your browser. Perfect for listening to music or podcasts in the background.

    Felipe

    2,479 users

  • SN Utils

    SN Utils

    ServiceNow Productivity tools. by SN Utils B.V.

    Arnoud Kooi

    2,470 users

  • Google Analytics Debugger

    Google Analytics Debugger

    Prints useful information to the JavaScript console by enabling the debug version of the Google Analytics Javascript. P.S: this add-on is migrated from Chrome store.

    Wildsky

    2,430 users

  • WebCast-Reloaded

    WebCast-Reloaded

    Detect multimedia URLs in each tab.

    Warren Bank

    2,418 users

  • GP

    GP

    GP Extension

    Thirdy

    2,415 users

  • AdDefender - AdBlocker

    AdDefender - AdBlocker

    This extension blocks ads on websites to improve user experience.

    Simple Inc.

    2,405 users

  • Merge Windows

    Merge Windows

    Merges the tabs from multiple windows together into one window. Extension won't show context menu item when there aren't more than one window of the same type to merge together. Private windows will only merge with private windows not normal.

    Jonathan Kingston

    2,400 users

  • ffCK Overlays

    ffCK Overlays

    Right-click any element to remove it. Inspired by the Chrome extension "F*ck Overlays".

    curtispf

    2,392 users

  • Wizdler

    Wizdler

    Parses the WSDL files and generates SOAP messages for you.

    Peter Prikryl

    2,376 users

  • PoE Overlay: Dash

    PoE Overlay: Dash

    Share your current session on pathofexile.com with PoE Overlay

    Kyusung4698

    2,358 users

  • Script Blocker Ultimate (NoScript, Disable JS)

    Script Blocker Ultimate (NoScript, Disable JS)

    Best Script Blocker for Firefox. (Best in Performance, This addon does NOT track user activities same as others)

    Mojtaba Daneshi

    2,277 users

  • VisBug

    VisBug

    Open source browser design tools

    argyleink

    2,255 users

  • HTTP request maker

    HTTP request maker

    Displays a sidebar that lets you to forge HTTP requests. Press Alt+Shift+Y to show the sidebar and make your own HTTP request. You can choose the method GET, HEAD, POST, OPTIONS, PUT DELETE and the body data to send. Response in the main window.

    stefano

    2,250 users

  • Carbonalyser

    Carbonalyser

    Allows to visualize the electricity consumption and greenhouse gases (GHG) emissions that your Internet browsing leads to.

    The Shift Project

    2,243 users

  • CRX Installer

    CRX Installer

    Install Chrome extension to Zen/Firefox nightly/Librewolf

    FoxRefire

    2,229 users

  • GeoSpoof: Spoof Geolocation & Timezone

    GeoSpoof: Spoof Geolocation & Timezone

    Spoof geolocation, fake your GPS location and timezone — change your location to any city or sync it to your VPN. No account.

    anthony

    2,225 users

  • {find+}

    {find+}

    A find-in-page extension with support for regular expressions.

    Brandon Richardson

    2,222 users

  • CookieManager - Cookie Editor

    CookieManager - Cookie Editor

    Edit cookies related to the current page and all its sub-frames right from a popup

    Joue

    2,188 users

  • FirePHP

    FirePHP

    Log from PHP to a devtools panel.

    cadorn

    2,182 users

  • LightSession Pro for ChatGPT

    LightSession Pro for ChatGPT

    Fix slow, laggy ChatGPT tabs in Firefox. Local-only extension that speeds up long conversations by trimming old messages from the page (no data leaves your browser).

    Emil K

    2,176 users

  • IBM Equal Access Accessibility Checker

    IBM Equal Access Accessibility Checker

    A web developer tool that checks web applications for accessibility issues.

    IBM Accessibility

    2,155 users

  • ASBPlayer: Learn with Subs

    ASBPlayer: Learn with Subs

    Language learning subtitle player for streaming platforms like Netflix, YouTube, and more.

    MirSolUu

    2,150 users

  • Youtube Play All

    Youtube Play All

    Adds a 'Play All' button to YouTube, allowing video playback in Latest, Popular, or Oldest order.

    CatBraaain

    2,150 users

  • PDF Combine - Convert and Merge

    PDF Combine - Convert and Merge

    Convert and merge multiple files with different formats into a single PDF document

    emano waldeck

    2,142 users

  • webhint

    webhint

    Check for best practices and common errors with your site's accessibility, speed, security and more.

    webhint

    2,135 users