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

Log in

1,171 extensions found in Web Development

Filter results
Search results
  • SEOLens

    SEOLens

    SEO lens — view title, description, Open Graph and canonical tags

    omyjuk

    42 users

  • GUIDGen

    GUIDGen

    GUID generator — create multiple UUIDs and copy with one click

    Raybon

    42 users

  • Request Diff

    Request Diff

    Make two requests to the same URL with a delay and visualise the response diff.

    marilyn

    42 users

  • Quick Draw

    Quick Draw

    Draw freehand notes on a persistent popup whiteboard

    ThomasGomez

    42 users

  • TimeBlock

    TimeBlock

    Block distracting websites during scheduled time windows

    Shreya

    42 users

  • Check It Off

    Check It Off

    Minimal checklist app with progress bar and storage

    Dickens Steven

    42 users

  • NetHeaders

    NetHeaders

    Inspect network headers — status codes, caching, security and CORS headers

    Jubair

    42 users

  • Hide w3schools on DuckDuckGo

    Hide w3schools on DuckDuckGo

    Removes w3schools[dot]com links from DuckDuckGo search results

    Inan Hira

    42 users

  • PixelRuler

    PixelRuler

    Draggable pixel ruler overlay to measure elements on any page

    Ozana

    42 users

  • DataImg

    DataImg

    Transform images into base64 data URIs — drag, drop and copy instantly

    fifor

    42 users

  • WebStack

    WebStack

    Identify the web stack of any site — frameworks, CMS, analytics and CDNs

    wrahimi

    42 users

  • Site Metrics

    Site Metrics

    Instant statistics: words, links, images and load time

    TayMeg

    42 users

  • Motion Spy

    Motion Spy

    Spy on page CSS animations and transitions in real time

    Padixow-

  • Word Count

    Word Count

    Advanced text statistics with density and keyword count

    Dositheus

    42 users

  • On Page Colors

    On Page Colors

    Scan page styles and collect dominant hex colors

    Ibrahim

    42 users

  • CSS Variables

    CSS Variables

    Extract all CSS custom properties from the current page

    Radbod Itzayana

    42 users

  • Gradient Generator

    Gradient Generator

    Create CSS gradients with color stops and direction

    Ygibson Robin

    42 users

  • Quote Drop

    Quote Drop

    Daily dose of wisdom from a curated collection of quotes

    rothen_buhler

    42 users

  • Konfetti Button

    Konfetti Button

    Add a floating confetti button to any page. Available in 6 languages.

    Eliooroz

    42 users

  • QR Generator

    QR Generator

    Generate a QR code for any URL or text instantly

    Oishially

    42 users

  • HashCalc

    HashCalc

    Calculate MD5, SHA-1, SHA-256 and SHA-512 hashes of any text

    Aexodi

    42 users

  • Expense Tracker

    Expense Tracker

    Log daily expenses by category and track your spending

    Eimhir

  • Pretty Code

    Pretty Code

    Paste messy code and get it cleanly formatted instantly

    Noela

    42 users

  • Color Blind Sim

    Color Blind Sim

    Simulate color blindness filters on the current webpage

    rojas.nicole

  • QRDrop

    QRDrop

    Generate a QR code for the current tab URL instantly

    Gagez

    42 users