Firefox GitHub Repositories (2026) · Open Source Tools

Playwright is a framework for Web Testing and Automation. It allows testing Chromium, Firefox and WebKit with a single API.

Welcome to a calmer internet

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

A powerful browser extension that supercharges DeepSeek Chat with custom tooling, persistent memory, and seamless project scaffolding. Generate and download files, run Python in-browser, create PowerPoint and Excel documents, build multi-file projects as ZIP archives, and manage custom skills and characters.

🦊 Anti-detect browser

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

A simple zero-config tool to make locally trusted development certificates with any names you'd like.

:cloud: Sync your bookmarks privately across browsers and devices

JavaScript API for Chrome and Firefox

Browser Tamer - browser proxy for Windows and Linux with autodetection, rules, scripting. 100% local, no tracking, no registration. Made with love and care, not AI and tracking.

Fast, reliable download accelerator and video downloader since 2013

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

The ultimate theme manager for Firefox-based browsers.

🗃 Open source self-hosted web archiving. Takes URLs/browser history/bookmarks/Pocket/Pinboard/etc., saves HTML, JS, PDFs, media, and more...

Improves Tab Folders & Groups for Zen Browser

This is a lightweight, headless browser purpose-built for AI agents (such as Codex or Claude Code) to perform browser automation tasks; it is designed to navigate through various web protection systems, login processes, and reverse-engineering scenarios

DuckDuckGo Privacy Essentials browser extension for Firefox, Chrome.

Neqo, the Mozilla Firefox implementation of QUIC in Rust

Webextension tool for Odoo

Turn any website into a native-like Android app