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Mozilla

Organization

Public GitHub footprint of Mozilla

@mozilla
View profile on GitHub

This technology could fall into the right hands.

Mountain View, California

2,553

Public repositories

191,182

Total stars

10,558

Followers

Mozilla has a significant public GitHub presence, showcasing a wide range of repositories primarily in Python, JavaScript, Rust, and TypeScript. Notable projects include pdf.js, a popular PDF reader, and DeepSpeech, an open-source speech-to-text engine, reflecting Mozilla's commitment to open-source technology and community collaboration.

Top languages

JavaScript 24Python 19Rust 16HTML 6C++ 4FreeMarker 4C 4TypeScript 4

Public repositories

pdf.js

53,440

PDF Reader in JavaScript

JavaScript
Updated Jun 12, 2026

DeepSpeech

26,747

DeepSpeech is an open source embedded (offline, on-device) speech-to-text engine which can run in real time on devices ranging from a Raspberry Pi 4 to high power GPU servers.

C++
Updated Jun 12, 2026

send

13,267

Simple, private file sharing from the makers of Firefox

FreeMarker
Updated Jun 12, 2026

readability

11,269

A standalone version of the readability lib

JavaScript
Updated Jun 12, 2026

TTS

10,151

:robot: :speech_balloon: Deep learning for Text to Speech (Discussion forum: https://discourse.mozilla.org/c/tts)

Jupyter Notebook
Updated Jun 12, 2026

nunjucks

8,963

A powerful templating engine with inheritance, asynchronous control, and more (jinja2 inspired)

JavaScript
Updated Jun 12, 2026

sccache

7,346

Sccache is a ccache-like tool. It is used as a compiler wrapper and avoids compilation when possible. Sccache has the capability to utilize caching in remote storage environments, including various cloud storage options, or alternatively, in local storage.

Rust
Updated Jun 12, 2026

mozjpeg

5,682

Improved JPEG encoder.

C
Updated Jun 13, 2026

Fira

5,157

DEPRECATED - Mozilla's new typeface, used in Firefox OS

CSS
Updated Jun 12, 2026

uniffi-rs

4,666

a multi-language bindings generator for rust

Rust
Updated Jun 12, 2026

rhino

4,588

Rhino is an open-source implementation of JavaScript written entirely in Java

JavaScript
Updated Jun 13, 2026

multi-account-containers

3,091

Firefox Multi-Account Containers lets you keep parts of your online life separated into color-coded tabs that preserve your privacy. Cookies are separated by container, allowing you to use the web with multiple identities or accounts simultaneously.

JavaScript
Updated Jun 12, 2026

web-ext

3,090

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

JavaScript
Updated Jun 12, 2026

webextension-polyfill

3,059

A lightweight polyfill library for Promise-based WebExtension APIs in Chrome

JavaScript
Updated Jun 12, 2026

cbindgen

2,894

A project for generating C bindings from Rust code

Rust
Updated Jun 12, 2026

node-convict

2,374

Featureful configuration management library for Node.js

JavaScript
Updated Jun 12, 2026

neqo

2,195

Neqo, the Mozilla Firefox implementation of QUIC in Rust

Rust
Updated Jun 12, 2026

fx-private-relay

1,740

Keep your email safe from hackers and trackers. Make an email alias with 1 click, and keep your address to yourself.

Python
Updated Jun 12, 2026

mentat

1,660

UNMAINTAINED A persistent, relational store inspired by Datomic and DataScript.

Rust
Updated Jun 12, 2026

pontoon

1,649

Mozilla's Localization Platform

Python
Updated Jun 12, 2026

kitsune

1,617

Platform for Mozilla Support

Python
Updated Jun 12, 2026

thimble.mozilla.org

1,423

UPDATE: This project is no longer maintained. Please check out Glitch.com instead.

JavaScript
Updated Jun 13, 2026

bedrock

1,323

Making mozilla.org awesome, one pebble at a time

HTML
Updated Jun 12, 2026

pdfjs-dist

1,308

Generic build of PDF.js library.

JavaScript
Updated Jun 13, 2026

server-side-tls

1,131

Server Side TLS Tools have moved

HTML
Updated Jun 12, 2026

inclusion

1,090

Our repository for Diversity, Equity and Inclusion work at Mozilla

Unknown Language
Updated Jun 12, 2026

cargo-vet

952

supply-chain security for Rust

Rust
Updated Jun 12, 2026

blurts-server

920

Mozilla Monitor arms you with tools to keep your personal information safe. Find out what hackers already know about you and learn how to stay a step ahead of them.

Fluent
Updated Jun 12, 2026

addons-server

897

🕶 addons.mozilla.org Django app and API 🎉

Python
Updated Jun 13, 2026

fxa

675

Monorepo for Mozilla Accounts (formerly Firefox Accounts)

TypeScript
Updated Jun 12, 2026

application-services

667

Firefox Application Services

Rust
Updated Jun 12, 2026

bugbug

565

Platform for Machine Learning projects on Software Engineering

Python
Updated Jun 12, 2026

addons-frontend

547

Front-end to complement mozilla/addons-server

JavaScript
Updated Jun 12, 2026

geckoview

539

GeckoView is a set of components for embedding Gecko in Android apps

HTML
Updated Jun 12, 2026

mp4parse-rust

446

Parser for ISO Base Media Format aka video/mp4 written in Rust.

Rust
Updated Jun 13, 2026

rust-code-analysis

416

Library to analyze and collect metrics on source code

Rust
Updated Jun 12, 2026

addons-linter

358

🔍 Firefox Add-ons linter, written in JavaScript. 👁

JavaScript
Updated Jun 12, 2026

bigquery-etl

335

Bigquery ETL

Python
Updated Jun 12, 2026

translations

310

The code, training pipeline, and models that power Firefox Translations

C++
Updated Jun 12, 2026

treeherder

274

A system for managing CI data for Mozilla projects

Python
Updated Jun 12, 2026

firefox-devtools-mcp

213

Model Context Protocol server for Firefox DevTools - enables AI assistants to inspect and control Firefox browser through the Remote Debugging Protocol

TypeScript
Updated Jun 12, 2026

telemetry-airflow

204

Airflow configuration for Telemetry

Python
Updated Jun 11, 2026

releases-comm-central

196

EXPERIMENTAL - copy of comm-central for forking on github

JavaScript
Updated Jun 12, 2026

nss

184

Network Security Services (NSS)

C
Updated Jun 12, 2026

dump_syms

165

Rewrite of breakpad dump_syms tools in Rust

Rust
Updated Jun 11, 2026

experimenter

144

A web application for managing user experiments for Mozilla Firefox.

Python
Updated Jun 12, 2026

infosec.mozilla.org

103

Guidelines, principles published on https://infosec.mozilla.org

JavaScript
Updated Jun 11, 2026

gcp-ingestion

89

Documentation and implementation of telemetry ingestion on Google Cloud Platform

Java
Updated Jun 12, 2026

bergamot-translator

80

INACTIVE - Bergamot translator

C++
Updated Jun 12, 2026

mozmill

80

DEPRECATED project - Check the Marionette framework instead

JavaScript
Updated Jun 11, 2026

cubeb-rs

76

No description provided for this repository.

Rust
Updated Jun 11, 2026

bugbot

64

A Mozilla release management tool to send reminders to Firefox developers and improve Bugzilla metadata

Python
Updated Jun 11, 2026

perfcompare

54

Improved Performance Comparison Tool

TypeScript
Updated Jun 11, 2026

snakepit

52

Machine learning job scheduler

JavaScript
Updated Jun 12, 2026

nestegg

51

WebM demuxer

C
Updated Jun 11, 2026

pilo

45

A powerful AI-powered web automation tool that helps you get answers and take actions in the browser.

TypeScript
Updated Jun 12, 2026

supply-chain

41

Aggregated audits for Rust crates by Mozilla

Unknown Language
Updated Jun 12, 2026

releases_insights

36

Parse various sources (hg log, apis, crashes…) to get some insights on past releases such as uplifts per beta, top crash signatures per nightly…

PHP
Updated Jun 12, 2026

ecosystem-platform

34

Documentation Hub for Firefox Accounts, Sync Client Integrations and More

ASL
Updated Jun 12, 2026

memchaser

31

Firefox extension to chase the memory usage and garbage collector activity

JavaScript
Updated Jun 12, 2026

mozbase-deprecated

31

Base utilties for mozilla test harnesses

Unknown Language
Updated Jun 11, 2026

fxa-content-server-l10n

29

translated strings for Firefox accounts website

Fluent
Updated Jun 12, 2026

release-notes

27

Release notes and system requirements for our various Firefoxen

Python
Updated Jun 12, 2026

probe-scraper

25

Scrape and publish Telemetry probe data from Firefox

Python
Updated Jun 11, 2026

lookml-generator

24

LookML Generator for Glean and Mozilla Data

Python
Updated Jun 12, 2026

foundation-security-advisories

23

Canonical source for Mozilla Foundation Security Advisories. http://www.mozilla.org/security/announce/

Python
Updated Jun 11, 2026

docker-etl

22

Collection of dockerized ETL jobs managed by data engineering.

Python
Updated Jun 12, 2026

persona-ios

21

using Persona from an iOS app

Objective-C
Updated Jun 12, 2026

metric-hub

20

Central hub for metric definitions that are considered the source of truth

Python
Updated Jun 12, 2026

enterprise-firefox

18

No description provided for this repository.

JavaScript
Updated Jun 12, 2026

looker-hub

18

Hub for Mozilla Looker models

LookML
Updated Jun 12, 2026

www.ccadb.org

18

Website about the Mozilla-run Common CA Database

HTML
Updated Jun 12, 2026

glean_parser

14

Tools for parsing the metadata for Mozilla's glean telemetry SDK

Python
Updated Jun 11, 2026

fx-desktop-qa-automation

13

Automations of Fx Desktop release smoke tests

HTML
Updated Jun 11, 2026

moz-l10n

11

Python and JavaScript tools for working with Mozilla localization files

Python
Updated Jun 11, 2026

telemetry-airflow-dags

10

DAGs collection for telemetry-airflow

Unknown Language
Updated Jun 12, 2026

enterprise-admin-reference

9

Admin reference for Firefox as an enterprise browser, including policy documentation and guides.

MDX
Updated Jun 12, 2026

clubcard-crlite

8

No description provided for this repository.

Rust
Updated Jun 12, 2026

happy-eyeballs

8

State machine implementation of Happy Eyeballs v3 in Rust

Rust
Updated Jun 11, 2026

performance-data

7

Respository to hold various performance data that is hosted on the performance dashboard.

Unknown Language
Updated Jun 13, 2026

addons-blog

7

Blog content builder for AMO

JavaScript
Updated Jun 12, 2026

bugdash

7

Dashboard of bug lists for Firefox-related components in Bugzilla, with a focus on triage and release tracking.

JavaScript
Updated Jun 12, 2026

release-notes-media

6

Images for inclusion within product release notes on www.mozilla.org

Unknown Language
Updated Jun 11, 2026

performance

6

Web-frontend for Firefox performance data.

JavaScript
Updated Jun 11, 2026

snakepit-client

5

Client for the snakepit machine learning job scheduler

JavaScript
Updated Jun 12, 2026

stmo-cli

5

Turn Claude Code into a data analyst on sql.telemetry.mozilla.org

Rust
Updated Jun 12, 2026

remote-settings-data

4

Git export of Remote Settings data

FreeMarker
Updated Jun 13, 2026

fxa-cms-l10n

4

No description provided for this repository.

Fluent
Updated Jun 12, 2026

aretestsfastyet

4

Dashboard showing how long Firefox test jobs take to complete.

HTML
Updated Jun 12, 2026

Relman

3

No description provided for this repository.

Python
Updated Jun 12, 2026

media-triage

3

Media Triage Dashboard

C++
Updated Jun 12, 2026

remote-settings-data-stage

2

Git export of Remote Settings STAGE data

FreeMarker
Updated Jun 13, 2026

remote-settings-data-dev

2

Git export of Remote Settings DEV data

FreeMarker
Updated Jun 13, 2026

fxsharing

2

Curated content sharing in firefox

JavaScript
Updated Jun 12, 2026

yara-x

2

This is a Mozilla fork of yara-x for our own custom needs.

Rust
Updated Jun 12, 2026

actions

1

GitHub actions shared by various Mozilla projects

Rust
Updated Jun 12, 2026

ssdlc-actions

0

Repo which contains the Github actions used in the Secure Software Development Lifecycle (SSDLC) workstreams

Unknown Language
Updated Jun 12, 2026

enterprise-thunderbird

0

This repository is for testing migration of hg->git. It is not (yet) an official repository for Thunderbird.

JavaScript
Updated Jun 12, 2026

openresty-oidc

0

Builds Mozilla's patched openresty-oidc container image. A thin wrapper around the upstream OpenResty Alpine image with lua-resty-openidc preinstalled, intended as a drop-in base for services terminating OpenID Connect at an OpenResty/NGINX reverse proxy.

Makefile
Updated Jun 11, 2026

nss-infra-testing

0

No description provided for this repository.

C
Updated Jun 11, 2026

Frequently asked questions

What does Mozilla build on GitHub?

Mozilla develops various open-source projects on GitHub, including tools like pdf.js for PDF viewing and DeepSpeech for speech recognition. These projects demonstrate their focus on web technologies and enhancing user experiences through innovative software.

Which programming languages does Mozilla use?

Mozilla utilizes several programming languages for its projects, predominantly Python, JavaScript, Rust, and TypeScript. This diverse language use allows them to address different aspects of software development and contribute to a range of applications.

Are Mozilla's repositories public?

Yes, all of Mozilla's repositories on GitHub are public. This openness allows developers and users to access, contribute to, and review their projects, reinforcing Mozilla's dedication to transparency and community involvement in technology.

Is this exposure intended?

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