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

Log in

11,678 extensions found in Web Development

Filter results
Search results
  • Website Performance Monitor

    Website Performance Monitor

    Monitor website performance, loading times, and optimization suggestions in real-time

    Vmax

    1 user

  • Port Checker

    Port Checker

    Quickly detect common port connectivity of a target IP or domain (based on HTTP/HTTPS detection).

    owoamier

    1 user

  • User Agent Parser

    User Agent Parser

    Minimal UserAgent parser for Mozilla FireFox

    Gokul Kathirvel

    1 user

  • Source Code Beautifier

    Source Code Beautifier

    Automatically format messy HTML, CSS, and JS for readability.

    Seth Beck

    1 user

  • fnthink Xget Now

    fnthink Xget Now

    幻念团队为 Firefox 浏览器提供的fnthink Xget 下载加速扩展，支持 GitHub、GitLab、npm、PyPI 等众多平台的文件下载加速

    fnthinklevi

    1 user

  • Shield WebSecure (by Sentinel)

    Shield WebSecure (by Sentinel)

    Real-time detection and masking of sensitive data for compliance and security

    SentinelAI

    1 user

  • LocalhostManager

    LocalhostManager

    Easily manage your different localhost servers for multi-project web development

    Chessmont

    1 user

  • Smart Image Downloader & Renamer

    Smart Image Downloader & Renamer

    Renames generic image filenames on download. Optional anonymized telemetry is available only with explicit user consent. Pilot version.

    Joconda

    1 user

  • Inject Custom JS and CSS

    Inject Custom JS and CSS

    Inject custom JavaScript and CSS code into any webpage

    Iván Ros

    1 user

  • YouTube Playlist Extractor

    YouTube Playlist Extractor

    A powerful tool to extract YouTube playlist data (Titles, URLs, Duration) directly to Excel (XLSX), CSV, or TXT. Works 100% locally with multi-language support.

    bouallati

    1 user

  • Floating Fullscreen Toggle

    Floating Fullscreen Toggle

    Adds a floating button to toggle fullscreen mode with a double-tap.

    sopadtortilla

    1 user

  • Yet Another YouTube Speed Controller

    Yet Another YouTube Speed Controller

    Adjust the YouTube playback speed more flexibly.

    sae

  • Lexcope – Multi Find, Search & Highlight Tool

    Lexcope – Multi Find, Search & Highlight Tool

    ⚡Lexcope is the ultimate Multi word search, multi find, and super highlight extension for Firefox

    Sathya Stark

    1 user

  • Audio Editor - By Mr.Bear

    Audio Editor - By Mr.Bear

    Professional audio editing and recording suite for Firefox. Multi-track editing, effects (reverb, delay, chorus, EQ), podcast production, recording, mixing, and export to MP3/WAV/FLAC.

    Mr.Bear

    1 user

  • Advanced Request Delayer

    Advanced Request Delayer

    Customize random delays for specific web requests with domain and RegExp control.

    SexyWerewolf

    1 user

  • HTTP Header Tracker

    HTTP Header Tracker

    Collects and analyzes HTTP header statistics

    erl-koenig

    1 user

  • Firestore fullscreen

    Firestore fullscreen

    Get a fullscreen experience when browsing the Firestore database (and GCP logs explorer)

    clementlize

    1 user

  • Cookie Pirate

    Cookie Pirate

    Keep cookies from leaving your browser.

    danmun

    1 user

  • Megavn.Net Player

    Megavn.Net Player

    Play video on server google drive

    Megavn.Net

    1 user

  • TemplateTree

    TemplateTree

    Hierarchical template management with tree-based right-click menu insertion

    Ben

    1 user

  • Wassalha Token Refresher

    Wassalha Token Refresher

    Get fresh token from wassalha.egyptpost.org and sends them to kssib

    Wassalha Token Refresh

    1 user

  • Flowchart Maker

    Flowchart Maker

    Create structured flowcharts directly in your browser.

    Kenya Shaun

    1 user

  • ViewGraph Capture

    ViewGraph Capture

    AI-powered UI capture and annotation for coding agents. Click bugs, get auto-suggestions, see trust indicators, send to your agent with full DOM context and 5-layer injection defense. Works with any MCP agent.

    Sourjya S. Sen

  • ColorZap

    ColorZap

    A vibrant extension to customize webpage backgrounds with a sleek color picker and preset colors, featuring a stunning dark-themed interface with neon effects.

    laura

    1 user

  • BitBucket Better PR Commit Message

    BitBucket Better PR Commit Message

    This extension will replace BitBucket's default pull request commit message with a more useful message, especially if you squash your PRs.

    reywood

    1 user