Mozilla (stylized as moz://a) is a free software community founded in 1998 by members of Netscape. The Mozilla community uses, develops, spreads and supports Mozilla products, thereby promoting exclusively free software and open standards, with only minor exceptions. The community is supported institutionally by the non-profit Mozilla Foundation and its tax-paying subsidiary, the Mozilla Corporation. Mozilla's current products include the Firefox web browser, Thunderbird e-mail client (now through a subsidiary), Bugzilla bug tracking system, Gecko layout engine, Pocket "read-it-later-online" service, and others.

Firefox for iOS

• UpdatedMar 17, 2025
• Swift

Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)

• UpdatedMar 13, 2025
• Kotlin

Firefox privacy, security and anti-tracking: a comprehensive user.js template for configuration and hardening

• UpdatedMar 12, 2025
• JavaScript

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

• UpdatedMar 15, 2025
• JavaScript

All of source code of version 10 or later of Floorp Browser, the most Advanced and Fastest Firefox derivative 🦊

• UpdatedMar 8, 2025
• C++

⚠️ Fenix (Firefox for Android) moved to a new repository. It is now developed and maintained as part of:https://github.com/mozilla-mobile/firefox-android

• UpdatedFeb 20, 2023
• Kotlin

The faster and smarter Debugger for Firefox DevTools 🔥🦊🛠

• UpdatedJan 11, 2023

user.js -- Firefox configuration hardening

• UpdatedFeb 10, 2025
• JavaScript

Komodo Edit is a fast and free multi-language code editor. Written in JS, Python, C++ and based on the Mozilla platform.

• UpdatedNov 15, 2023
• Python

Firefox Decrypt is a tool to extract passwords from Mozilla (Firefox™, Waterfox™, Thunderbird®, SeaMonkey®) profiles

• UpdatedNov 8, 2024
• Python

⚠️ Firefox Focus (Android) moved to a new repository. It is now developed and maintained as part of:https://github.com/mozilla-mobile/firefox-android

• UpdatedDec 13, 2022
• Kotlin

⚠️ This project moved to a new repository. It is now developed and maintained at:https://github.com/mozilla-mobile/firefox-android

• UpdatedOct 31, 2022
• Kotlin

Neqo, the Mozilla Firefox implementation of QUIC in Rust

• UpdatedMar 15, 2025
• Rust

Librefox: Firefox with privacy enhancements

• UpdatedMar 28, 2021
• JavaScript

Mozilla's Localization Platform

• UpdatedMar 13, 2025
• Python

Making mozilla.org awesome, one pebble at a time

• UpdatedMar 14, 2025
• HTML

⚠️ Firefox Focus (iOS) has moved to a new repository. It is now developed and maintained as part of:https://github.com/mozilla-mobile/firefox-ios

• UpdatedMar 5, 2024
• Swift

nidium is an ongoing effort for a mobile hw-accelerated rendering engine to create apps and games. Embedding Mozilla JavaScript VM, Google Skia, Facebook Yoga.https://twitter.com/nidiumproject for updates

• UpdatedNov 12, 2019
• C++

The DownThemAll! WebExtension

• UpdatedOct 16, 2024
• TypeScript

Winner of Mozilla's $50,000 prize for AI

• UpdatedApr 26, 2023
• JavaScript