To use Android extensions, you'll need Firefox for Android. To explore Firefox for desktop add-ons, please visit our desktop site.

Log in

1,151 extensions found in Web Development

Filter results
Search results
  • SnipPaste

    SnipPaste

    Save and paste reusable text snippets into any input field

    ElianBrad

    34 users

  • Speed Reader

    Speed Reader

    Flash words at high speed to train your reading pace

    nexma

    34 users

  • Wayback Machine Searcher

    Wayback Machine Searcher

    Search the current page URL on the Wayback Machine archive.

    Jakob

    34 users

  • Better Page Ruler

    Better Page Ruler

    Draw, resize, drag and move a ruler box on any webpage.

    Sayedul Sayem

    34 users

  • Tab Clone

    Tab Clone

    Clone one or multiple tabs with a single click action

    Otto Hamidah

    34 users

  • Token Inspect

    Token Inspect

    Parse JWT bearer tokens and display claims in a clean UI

    Dobrica

    34 users

  • RefreshLoop

    RefreshLoop

    Loop tab refreshes on a timer — configurable intervals per tab

    Duda Eleonora

    34 users

  • Broken Link

    Broken Link

    Find broken and redirected links on any webpage fast

    Santan

    33 users

  • Color Palette

    Color Palette

    Generate harmonious color palettes from any base color

    Viacheslav

    33 users

  • Opened Tab Counter

    Opened Tab Counter

    Displays the number of open tabs on the badge. Click to see a list of all tabs, search, and close duplicates.

    sarahsusan

    33 users

  • HexSnap

    HexSnap

    Snap hex codes from any color on any page with one click

    Varriale

    33 users

  • HTTP Tracker

    HTTP Tracker

    Track requests made by current page with type breakdown

    iuhuwe

    33 users

  • Cookie Rejecter

    Cookie Rejecter

    Automatically rejects cookie consent banners on websites.

    Majken

    33 users

  • Wayback Saver

    Wayback Saver

    Submit any page to the Internet Archive Wayback Machine with one click.

    blakex

    33 users

  • MDtoHTML

    MDtoHTML

    Convert Markdown text to HTML with live preview and copy-ready output

    FoxyDoxy

    32 users

  • IP Info

    IP Info

    Show your public IP address location ISP and more

    KhatunejAnnat

    32 users

  • DNS Lookup

    DNS Lookup

    Look up DNS records for any domain with multiple types

    Sandra Baer

    32 users

  • Purplemonkey2

    Purplemonkey2

    Just like Violentmonkey, but with more unsafe API.

    gholk

    32 users

  • NoBanner

    NoBanner

    One click to remove all fixed banners, cookie bars and sticky headers

    jubairislam

    32 users

  • URL Redirect Chain

    URL Redirect Chain

    Trace the full HTTP redirect chain for any URL. Shows status codes at every hop and detects redirect loops.

    Lucia

    32 users

  • Display Info

    Display Info

    Display screen resolution, viewport size, device pixel ratio, color depth, orientation, and aspect ratio.

    Anna Balashova

    32 users

  • AB Test Detector

    AB Test Detector

    Detect A/B testing and feature flag tools on any webpage: Optimizely, VWO, LaunchDarkly, Statsig, and 15 more.

    Alfredo

    32 users

  • Experiment Finder

    Experiment Finder

    Detect A/B testing and feature flag tools on any webpage: Optimizely, VWO, LaunchDarkly, Statsig, and 15 more.

    Alfredo

    32 users

  • Whiteboard

    Whiteboard

    Simple canvas whiteboard for quick sketching and drawing

    ThomasGomez

    32 users

  • Markdown Notes

    Markdown Notes

    Write markdown notes with preview that persist across sessions

    Margahara

    32 users