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

Log in

1,150 extensions found in Web Development

Filter results
Search results
  • Palette Forge

    Palette Forge

    Create complementary analogous and triadic color schemes

    Pibibuw

  • Keyframe

    Keyframe

    CSS @keyframes animation builder with live preview

    everett

  • Tally

    Tally

    Multiple named tally counters with increment and reset

    swaswan

  • CC Check

    CC Check

    Credit card number validator with Luhn check and type

    sesay.ana

  • Web Crypto API Wrap

    Web Crypto API Wrap

    Compute cryptographic hashes using the Web Crypto API

    Imar

  • PostPro AI - Grow on LinkedIn!

    PostPro AI - Grow on LinkedIn!

    Predict LinkedIn post virality and enhance your content before publishing. AI-powered analysis for better engagement and reach. Grow your LinkedIn presence with AI-powered content intelligence.

    Sumanth

    3 users

  • Tetris Game - By Mr.Bear

    Tetris Game - By Mr.Bear

    Classic Tetris with a bear theme! Stack the blocks and clear lines!

    Mr.Bear

    3 users

  • Domain Age Finder Google SERP

    Domain Age Finder Google SERP

    Find & highlight domains under 4 years old on Google SERP for SEO analysis.This extension enhances your Google search experience by providing domain age information directly on the search results page.

    Semantic Pen

    3 users

  • YAML Lint

    YAML Lint

    YAML validator and formatter with JSON conversion

    ianpickrell

  • Home Loan

    Home Loan

    Quick mortgage calculator with amortisation summary

    Shenit

  • BMI Calc

    BMI Calc

    Calculate Body Mass Index with category and ideal weight

    Jemima

  • Brand Palette

    Brand Palette

    Build a full brand color palette with semantic names

    norakrfjy

  • Minify Code

    Minify Code

    Strip whitespace and comments from CSS JS and HTML code

    Briallen

  • Status Ref

    Status Ref

    Quick HTTP status code reference with search filter

    Inocencio Máedóc

  • CSS Spec

    CSS Spec

    Calculate CSS specificity for any selector instantly

    Sansone Janeth

  • Cron Helper

    Cron Helper

    Create and decode cron schedule expressions fast

    Tilaruc Luna

  • Preset Grads

    Preset Grads

    50 hand-picked CSS gradients ready to copy and use

    Damir Davisvo

  • HTTP Codes

    HTTP Codes

    Search HTTP status codes with descriptions and classes

    Inocencio Máedóc

  • FTT Link

    FTT Link

    Raccourcissez vos liens en un clic directement depuis votre navigateur, sans compte, sans pub, sans tracking. 🚀

    Julien Frejaville

    3 users

  • World Clock

    World Clock

    Show current time in multiple timezones at once

    Zakaig

  • Pwd Strength

    Pwd Strength

    Analyse password strength and get improvement tips

    Tydecy

  • Aegis

    Aegis

    Un bouclier de protection avancé qui rend votre empreinte numérique anonyme en imitant des profils d'appareils courants.

    Yahya

    3 users

  • IWolf SEO Checker

    IWolf SEO Checker

    Analyze on-page SEO for any URL: title & meta description length, H1 count, images without ALT, and word count. Instant results, no tracking, no data collection. IWolf websites.

    IWolf Websites

    3 users

  • Crunchbase - Monthly Limit Unlocker

    Crunchbase - Monthly Limit Unlocker

    Removes the “monthly limit reached” overlay shown on Crunchbase pages for logged-in free account users on Firefox Desktop and Android.

    Risk333

    3 users

  • Flex Builder

    Flex Builder

    Build flexbox layouts visually and copy the CSS output

    rutz-ronald