Open Source Browsers & Extensions Tools

uBlock ★ 69K

uBlock Origin - An efficient blocker for Chromium and Firefox. Fast and lean.

Ladybird ★ 67K

An independent browser engine built from scratch, not a fork

chrome-devtools-mcp ★ 55K

Chrome DevTools for coding agents

monaco-editor ★ 47K

A browser based code editor

Zen Browser ★ 46K

Privacy-focused browser with powerful customization

servo ★ 38K

Servo aims to empower developers with a lightweight, high-performance alternative for embedding web technologies in applications.

serenity ★ 34K

The Serenity Operating System 🐞

refined-github ★ 32K

:octocat: Browser extension that simplifies the GitHub interface and adds useful features

slate ★ 32K

A completely customizable framework for building rich text editors. (Currently in beta.)

Avalonia ★ 32K

Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The future of .NET UI

webtorrent ★ 31K

⚡️ Streaming torrent client for the web

obscura ★ 30K

The headless browser for AI agents and web scraping

fingerprintjs ★ 29K

The most advanced free and open-source browser fingerprinting library

quasar ★ 27K

Quasar Framework - Build high-performance VueJS user interfaces in record time

chromium ★ 25K

The official GitHub mirror of the Chromium source

nextai-translator ★ 25K

基于 ChatGPT API 的划词翻译浏览器插件和跨平台桌面端应用 - Browser extension and cross-platform desktop application for translation based on ChatGPT API.

Brave ★ 24K

Fast, private browser that puts you first

mocha ★ 23K

☕️ Classic, reliable, trusted test framework for Node.js and the browser

SingleFile ★ 23K

Web Extension for saving a faithful copy of a complete web page in a single HTML file

Helium ★ 22K

Privacy-first browser with ad-blocking and no bloat

ego-lite ★ 21K

The fastest browser for AI agents to run browser automation, built for sharing your logged-in browser state with your AI agents, like Codex or Claude Code, with

daily ★ 20K

daily.dev is the personalized developer news feed and community. Get the best tech content from all over the web in your browser new tab or on mobile. Free and

Screenity ★ 19K

Free, private screen recording for Chrome

Harper ★ 17K

Fast grammar checking that respects your privacy

javascript-obfuscator ★ 16K

A powerful obfuscator for JavaScript and Node.js

feathers ★ 15K

The API and real-time application framework

LanguageTool ★ 15K

AI-powered grammar checker for 30+ languages

browserify ★ 15K

browser-side require() the node.js way

HackBrowserData ★ 15K

Extract and decrypt browser data, supporting multiple data types, runnable on various operating systems (macOS, Windows, Linux).

kysely ★ 14K

A type-safe TypeScript SQL query builder

BrowserOS ★ 14K

🌐 The open-source Agentic browser; alternative to ChatGPT Atlas, Perplexity Comet, Dia.

nanobrowser ★ 14K

Open-Source Chrome extension for AI-powered web automation. Run multi-agent workflows using your own LLM API key. Alternative to OpenAI Operator.

peerjs ★ 14K

Simple peer-to-peer with WebRTC.

plasmo ★ 13K

🧩 The Browser Extension Framework

firefox-ios ★ 13K

Firefox for iOS

qutebrowser ★ 12K

A keyboard-driven, vim-like browser based on Python and Qt.

turndown ★ 12K

🛏 An HTML to Markdown converter written in JavaScript

Betterfox ★ 11K

Firefox user.js for optimal privacy and security. Your favorite browser, but better.

chatGPTBox ★ 11K

Integrating ChatGPT into your browser deeply, everything you need is here

testcafe ★ 9.9K

A Node.js tool to automate end-to-end web testing.

buster ★ 9.4K

Captcha solver extension for humans, available for Chrome, Edge and Firefox

artillery ★ 9.1K

The complete load testing platform. Everything you need for production-grade load tests. Serverless & distributed. Load test with Playwright. Load test HTTP API

Floorp ★ 8.5K

All of source code of Floorp 12, the most Advanced and Fastest Firefox derivative 🦊

isomorphic-git ★ 8.4K

A pure JavaScript implementation of git for node and browsers!

xdm ★ 8.3K

Fast file and video downloader with HLS, DASH and batch download support

snapdom ★ 8.2K

High-performance engine for capturing, modifying, and converting DOM elements into any format.

jose ★ 7.9K

JWA, JWS, JWE, JWT, JWK, JWKS for Node.js, Browser, Cloudflare Workers, Deno, Bun, and other Web-interoperable runtimes

thorium ★ 7.6K

Chromium fork named after radioactive element No. 90. Source code and Linux releases. Windows/MacOS/ARM builds served in different repos, links are towards the

RSSHub-Radar ★ 7.4K

🧡 Browser extension that simplifies finding and subscribing RSS and RSSHub

hotkeys-js ★ 7.1K

➷ A robust Javascript library for capturing keyboard input. It has no dependencies.

llm-scraper ★ 7.0K

Turn any webpage into structured data using LLMs

Requestly ★ 6.8K

Intercept, modify, and debug HTTP(S) requests effortlessly

ublacklist ★ 6.7K

Blocks specific sites from appearing in Google search results

BilibiliSponsorBlock ★ 6.3K

一款跳过小电视视频中恰饭片段的浏览器插件，移植自 SponsorBlock。A browser extension to skip sponsored segments in videos, ported from the SponsorBlock

sandbox ★ 6.3K

All-in-One Sandbox for AI Agents that combines Browser, Shell, File, MCP and VSCode Server in a single Docker container.

docx ★ 6.0K

Easily generate and modify .docx files with JS/TS with a nice declarative API. Works for Node and on the Browser.

extism ★ 5.8K

The framework for building with WebAssembly (wasm). Easily & securely load wasm modules, move data, call functions, and build extensible apps.

Recorder ★ 5.6K

html5 js 录音 mp3 wav ogg webm amr g711a g711u 格式，支持pc和Android、iOS部分Web浏览器、Hybrid App（提供Android iOS App源码）、微信，提供ASR语音识别转文字 H5版语音通话聊天示例 DTMF编码解码

CefFlashBrowser ★ 5.5K

Flash浏览器 / Flash Browser

obsidian-clipper ★ 5.5K

Highlight and capture the web in your favorite browser. The official Web Clipper extension for Obsidian.

canvas-editor ★ 5.3K

A Canvas/SVG-based rich text editor

finicky ★ 5.2K

A macOS app for customizing which browser to start

opal ★ 4.9K

Ruby ♥︎ JavaScript

happy-dom ★ 4.7K

A JavaScript implementation of a web browser without its graphical user interface

webui ★ 4.6K

Use any web browser or WebView as GUI, with your preferred language in the backend and modern web technologies in the frontend, all in a lightweight portable li

chrome-remote-interface ★ 4.6K

Chrome Debugging Protocol interface for Node.js

terminal-browser ★ 4.4K

A browser inside your terminal

I-Still-Dont-Care-About-Cookies ★ 4.3K

Debloated fork of the extension "I don't care about cookies"

browser-agent ★ 4.1K

Open-source, vision-first browser agent

Darkument ★ 4.0K

A sleek, privacy-focused browser extension that brings a native dark mode experience to online documents. Built with clean UI/UX principles for Chromium and Ope

zip.js ★ 3.9K

JavaScript library to zip and unzip files supporting parallel compression, web streams, pluggable compression engines, zip64, split files, data encryption, and

search-by-image ★ 3.8K

Browser extension for reverse image search, available for Chrome, Edge and Safari

flutter_inappwebview ★ 3.8K

A Flutter plugin that allows you to add an inline webview, to use a headless webview, and to open an in-app browser window.

EhSyringe ★ 3.8K

E 站注射器，将中文翻译注入到 E 站体内

gosub-engine ★ 3.7K

The Gosub browser engine

GhostText ★ 3.6K

👻 Use your text editor to write in your browser. Everything you type in the editor will be instantly updated in the browser (and vice versa).

Deta Surf ★ 3.6K

Browser and notebook combined with local-first AI

eventemitter3 ★ 3.5K

EventEmitter3 - Because there's also a number 2. And we're faster.

emacs-application-framework ★ 3.5K

EAF, an extensible framework that revolutionizes the graphical capabilities of Emacs

aliasvault ★ 3.4K

Privacy-first password manager with built-in email aliasing. Fully encrypted and self-hostable.

fingerprint-chromium ★ 3.2K

An open source fingerprint browser based on Ungoogled Chromium. 指纹浏览器 隐私浏览器

web-ext ★ 3.2K

A command line tool to help build, run, and test web extensions

android-titanium-browser ★ 3.1K

Secure open-source Android browser with support for extensions

just-the-browser ★ 3.1K

Remove AI features, telemetry data reporting, sponsored content, product integrations, and other annoyances from web browsers.

badssl.com ★ 3.1K

:lock: Memorable site for testing clients against bad SSL configs.

remirror ★ 3.0K

ProseMirror toolkit for React 🎉

ghostty-web ★ 3.0K

Ghostty for the web with xterm.js API compatibility

database-build ★ 3.0K

In-browser Postgres sandbox with AI assistance (formerly postgres.new)

Transcrypt ★ 2.9K

Python 3.9 to JavaScript compiler - Lean, fast, open!

ScrollToPrompt ★ 2.8K

Navigation minimap extension for modern AI chat interfaces, injecting responsive scrollbar indicators via Shadow DOM isolation.

SmartProxy ★ 2.8K

Firefox/Chrome browser extension. SmartProxy will automatically enable/disable proxy for the sites you visit, based on customizable patterns.

slugify ★ 2.7K

Slugify a string

biomes-game ★ 2.7K

Biomes is an open source sandbox MMORPG built for the web using web technologies such as Next.js, Typescript, React and WebAssembly.

tus-js-client ★ 2.6K

A pure JavaScript client for the tus resumable upload protocol

ws-scrcpy ★ 2.6K

Web client prototype for scrcpy.

WebChat ★ 2.6K

💬 Chat with anyone on any website.

BookmarkHub ★ 2.6K

BookmarkHub , sync bookmarks across different browsers

Thorium-Win ★ 2.6K

Chromium fork for Windows named after radioactive element No. 90; Windows builds of https://github.com/Alex313031/Thorium

brownies ★ 2.6K

🍫 Tastier cookies, local, session, and db storage in a tiny package. Includes subscribe() events for changes.

Lightning-Browser ★ 2.5K

A lightweight Android browser with modern navigation

keepassxc-browser ★ 2.4K

KeePassXC Browser Extension

luakit ★ 2.3K

Fast, small, webkit based browser framework extensible by Lua.

percy ★ 2.3K

Build frontend browser apps with Rust + WebAssembly. Supports server side rendering.

otplib ★ 2.3K

One Time Password (OTP) / 2FA for Node.js and Browser - Supports HOTP, TOTP and Google Authenticator

azure-sdk-for-js ★ 2.3K

This repository is for active development of the Azure SDK for JavaScript (NodeJS & Browser). For consumers of the SDK we recommend visiting our public develope

xmpp.js ★ 2.3K

XMPP for JavaScript

reynard-browser ★ 1.9K

An experimental Gecko-based web browser for iOS 13+.

VideoTogether ★ 1.8K

Browser Extension to Sync Video Playback on All Video Platforms / 一起看视频浏览器插件，兼容所有平台

hermes-browser-extension ★ 1.8K

Browser-native side panel for Hermes Agent — connect web context to your local Hermes runtime.

cookie-editor ★ 1.8K

A powerful browser extension to create, edit and delete cookies

markdown-viewer ★ 1.7K

Markdown Viewer / Browser Extension

maxurl ★ 1.7K

Finds larger/original versions of images and videos

archiveweb.page ★ 1.6K

A High-Fidelity Web Archiving Extension for Chrome and Chromium based browsers!

web-archives ★ 1.6K

Browser extension for viewing archived and cached versions of web pages, available for Chrome, Edge and Safari

UserAgent-Switcher ★ 1.5K

A User-Agent spoofer browser extension that is highly configurable

Mercury ★ 1.5K

Firefox fork with compiler optimizations and patches from Librewolf, Waterfox, and GNU IceCat.

news-feed-eradicator ★ 1.5K

A browser extension that deletes your news feed and replaces it with a nice quote

duckduckgo-privacy-extension ★ 1.5K

DuckDuckGo Privacy Essentials browser extension for Firefox, Chrome.

MarvellousSuspender ★ 1.4K

A free, open-source Chrome extension - no ads, no tracking. Based on The Great Suspender, cleaned up and actively maintained.

social-media-copilot ★ 1.4K

社媒助手开源版 - 小红书、抖音、快手等平台数据采集的浏览器插件，可通过API调用，支持Docker部署。

TKScript ★ 1.4K

油猴脚本 & 浏览器扩展

competitive-companion ★ 1.3K

Browser extension which parses competitive programming problems

auto-tab-discard ★ 1.2K

Use native tab discarding method to automatically reduce memory usage of inactive tabs

stackprism ★ 1.2K

StackPrism is a browser extension for detecting website technology stacks.

Flow ★ 1.1K

Fast, secure browsing with powerful organization features

WebLibre ★ 1.1K

A libre Android browser built from scratch on Gecko. Privacy by default, powerful tab containers, and a local-first search engine.

Linguist ★ 1.1K

Privacy-focused translation with offline capabilities

GPT-Conversation-Toolkit ★ 973

A power-user toolkit for ChatGPT Web — full and selective conversation export, PNG long-image export, deep-history search, timeline navigation, prompt managemen

pasteguard ★ 805

AI gets the context. Not your private data. Local-first privacy proxy for browser chat, AI APIs, and coding agents.

Thorium-Android ★ 802

Thorium builds for Android (arm64 and arm32).

better-deepseek ★ 801

A powerful browser extension that supercharges DeepSeek Chat with custom tooling, persistent memory, and seamless project scaffolding. Generate and download fil

NiceTab ★ 789

浏览器插件：OneTab、Toby、N-Tab、SessionBuddy、KepTab 等扩展的升级替代品，功能丰富易用 | A nice, convenient, powerful tab manager serving as an upgraded alternative to OneTab, Toby, Ses

favbox ★ 772

🔖 FavBox is a local-first experimental browser extension that enhances and simplifies bookmark management without cloud storage or third-party services.

mue ★ 772

Fast, open and free-to-use new tab page for modern browsers

random-user-agent ★ 760

😎 Browser extension that automatically replaces the User-Agent with a randomized one

MaterialYouNewTab ★ 758

MY NewTab: A Simple New Tab (browser's home page) inspired with Google's 'Material You' design

keyFinder ★ 729

Passive API key and secret discovery browser extension for Chrome and Firefox. 80+ detection patterns, zero config.

brie-extension ★ 724

Capture screenshots, console errors, network issues, and user actions, giving developers full context instantly.

prism-download-manager ★ 711

The fast, beautiful, open-source download manager for Windows, macOS and Linux — up to 32 connections, browser integration, video & MP3 downloads, crash-safe re

chrome-tab-modifier ★ 703

Take control of your tabs

Library-Detector-for-Chrome ★ 680

🔍 Extension that detects which JavaScript libraries are running on a page

jumpcutter ★ 679

⏩ Fast-forwards long pauses between sentences — watch lectures ~1.5x faster (browser extension)

lightning-browser-extension ★ 586

The Bitcoin Lightning Browser Extension that brings deep Lightning & Nostr integration to the web. Wallet interface to multiple lightning nodes and key signer f

BetterViewer ★ 571

A fast image viewer and editor for your browser and desktop

Notion-Boost-browser-extension ★ 551

Chrome & Firefox extension for Notion to add 20+ features like sticky outline, small text & full width by default, hide comments & help button, bolder text etc.

parchi ★ 546

Your AI friend right in your browser

NooBox ★ 522

A Chrome Extension that contains useful tools

Browser Operator ★ 516

Open-source AI browser for intelligent web automation

Midori Browser ★ 412

Fast, secure, and privacy-focused web browsing