| mozilla/pdf.js | PDF Reader in JavaScript | 52,905 | JavaScript |
| mozilla/DeepSpeech | 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. | 26,737 | C++ |
| mozilla/send | Simple, private file sharing from the makers of Firefox | 13,280 | FreeMarker |
| mozilla/readability | A standalone version of the readability lib | 10,959 | JavaScript |
| mozilla/TTS | :robot: :speech_balloon: Deep learning for Text to Speech (Discussion forum: https://discourse.mozilla.org/c/tts) | 10,117 | Jupyter Notebook |
| mozilla/BrowserQuest | DEPRECATED - A HTML5/JavaScript multiplayer game experiment | 9,364 | JavaScript |
| mozilla/nunjucks | A powerful templating engine with inheritance, asynchronous control, and more (jinja2 inspired) | 8,903 | JavaScript |
| mozilla/geckodriver | WebDriver Classic proxy for automating Firefox through Marionette | 7,447 | — |
| mozilla/sccache | 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. | 7,049 | Rust |
| mozilla/mozjpeg | Improved JPEG encoder. | 5,667 | C |
| mozilla/Fira | Mozilla's new typeface, used in Firefox OS | 5,155 | CSS |
| mozilla/rhino | Rhino is an open-source implementation of JavaScript written entirely in Java | 4,554 | JavaScript |
| mozilla/uniffi-rs | a multi-language bindings generator for rust | 4,361 | Rust |
| mozilla/source-map | Consume and generate source maps. | 3,700 | JavaScript |
| mozilla/gecko-dev | SUPERSEDED by https://github.com/mozilla-firefox/firefox. Read-only Git mirror of the Mercurial gecko repositories at https://hg.mozilla.org | 3,671 | JavaScript |
| mozilla/shumway | Shumway is a Flash VM and runtime written in JavaScript | 3,670 | TypeScript |
| mozilla/web-ext | A command line tool to help build, run, and test web extensions | 3,036 | JavaScript |
| mozilla/webextension-polyfill | A lightweight polyfill library for Promise-based WebExtension APIs in Chrome | 3,035 | JavaScript |
| mozilla/multi-account-containers | 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. | 3,032 | JavaScript |
| mozilla/cbindgen | A project for generating C bindings from Rust code | 2,840 | Rust |
| mozilla/node-convict | Featureful configuration management library for Node.js | 2,378 | JavaScript |
| mozilla/MozDef | DEPRECATED - MozDef: Mozilla Enterprise Defense Platform | 2,170 | Python |
| mozilla/neqo | Neqo, the Mozilla Firefox implementation of QUIC in Rust | 2,152 | Rust |
| mozilla/popcorn-js | The HTML5 Media Framework. (Unmaintained. See https://github.com/menismu/popcorn-js for activity) | 2,135 | JavaScript |
| mozilla/hawk | INACTIVE - HTTP Holder-Of-Key Authentication Scheme | 2,011 | JavaScript |
| mozilla/cipherscan | A very simple way to find out which SSL ciphersuites are supported by a target. | 1,990 | Python |
| mozilla/fathom | DEPRECATED - A framework for extracting meaning from web pages | 1,968 | JavaScript |
| mozilla/http-observatory | Mozilla HTTP Observatory | 1,855 | Python |
| mozilla/persona | Persona is a secure, distributed, and easy to use identification system. | 1,833 | JavaScript |
| mozilla/fx-private-relay | Keep your email safe from hackers and trackers. Make an email alias with 1 click, and keep your address to yourself. | 1,694 | Python |
| mozilla/mentat | UNMAINTAINED A persistent, relational store inspired by Datomic and DataScript. | 1,657 | Rust |
| mozilla/task.js | Beautiful concurrency for JavaScript | 1,628 | JavaScript |
| mozilla/pontoon | Mozilla's Localization Platform | 1,622 | Python |
| mozilla/kitsune | Platform for Mozilla Support | 1,551 | Python |
| mozilla/thimble.mozilla.org | UPDATE: This project is no longer maintained. Please check out Glitch.com instead. | 1,420 | JavaScript |
| mozilla/grcov | Rust tool to collect and aggregate code coverage data for multiple source files | 1,335 | Rust |
| mozilla/bedrock | Making mozilla.org awesome, one pebble at a time | 1,315 | HTML |
| mozilla/pdfjs-dist | Generic build of PDF.js library. | 1,301 | JavaScript |
| mozilla/policy-templates | Policy Templates for Firefox | 1,273 | Batchfile |
| mozilla/rust-android-gradle | — | 1,254 | Kotlin |
| mozilla/mig | Distributed & real time digital forensics at the speed of the cloud | 1,204 | Go |
| mozilla/server-side-tls | Server side TLS Tools | 1,133 | HTML |
| mozilla/contain-facebook | Facebook Container isolates your Facebook activity from the rest of your web activity in order to prevent Facebook from tracking you outside of the Facebook website via third party cookies. | 1,058 | JavaScript |
| mozilla/inclusion | Our repository for Diversity, Equity and Inclusion work at Mozilla | 1,032 | — |
| mozilla/narcissus | INACTIVE - http://mzl.la/ghe-archive - The Narcissus meta-circular JavaScript interpreter | 921 | JavaScript |
| mozilla/blurts-server | 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. | 893 | Fluent |
| mozilla/addons-server | 🕶 addons.mozilla.org Django app and API 🎉 | 891 | Python |
| mozilla/openbadges-backpack | Mozilla Open Badges Backpack | 868 | JavaScript |
| mozilla/DeepSpeech-examples | Examples of how to use or integrate DeepSpeech | 858 | Python |
| mozilla/dxr | DEPRECATED - Powerful search for large codebases | 820 | Python |
| mozilla/awsbox | INACTIVE - http://mzl.la/ghe-archive - A featherweight PaaS on top of Amazon EC2 for deploying node apps | 807 | JavaScript |
| mozilla/cargo-vet | supply-chain security for Rust | 794 | Rust |
| mozilla/ssh_scan | DEPRECATED - A prototype SSH configuration and policy scanner (Blog: https://mozilla.github.io/ssh_scan/) | 788 | Ruby |
| mozilla/node-client-sessions | secure sessions stored in cookies | 762 | JavaScript |
| mozilla/chromeless | DEPRECATED - Build desktop applications with web technologies. | 759 | JavaScript |
| mozilla/doctorjs | A set of static analysis tools for JavaScript | 740 | JavaScript |
| mozilla/standards-positions | — | 717 | HTML |
| mozilla/playdoh | PROJECT DEPRECATED (WAS: "Mozilla's Web application base template. Half Django, half awesomeness, half not good at math.") | 706 | Python |
| mozilla/fxa | Monorepo for Mozilla Accounts (formerly Firefox Accounts) | 664 | TypeScript |
| mozilla/application-services | Firefox Application Services | 661 | Rust |
| mozilla/tofino | Project Tofino is a browser interaction experiment. | 651 | HTML |
| mozilla/addon-sdk | DEPRECATED - The Add-on SDK repository. | 638 | — |
| mozilla/MozStumbler | Android Stumbler for Mozilla | 622 | Java |
| mozilla/lightbeam | Orignal unmaintained version of the Lightbeam extension. See lightbeam-we for the new one which works in modern versions of Firefox. | 587 | JavaScript |
| mozilla/ichnaea | Mozilla Ichnaea | 586 | Python |
| mozilla/nixpkgs-mozilla | Mozilla overlay for Nixpkgs. | 577 | Nix |
| mozilla/positron | a experimental, Electron-compatible runtime on top of Gecko | 574 | — |
| mozilla/moz-sql-parser | DEPRECATED - Let's make a SQL parser so we can provide a familiar interface to non-sql datastores! | 572 | Python |
| mozilla/firefox-translations | Firefox Translations is a webextension that enables client side translations for web browsers. | 567 | JavaScript |
| mozilla/spidernode | Node.js on top of SpiderMonkey | 564 | JavaScript |
| mozilla/bugbug | Platform for Machine Learning projects on Software Engineering | 557 | Python |
| mozilla/tls-observatory | An observatory for TLS configurations, X509 certificates, and more. | 544 | Go |
| mozilla/addons-frontend | Front-end to complement mozilla/addons-server | 543 | JavaScript |
| mozilla/mozilla-django-oidc | A django OpenID Connect library | 534 | Python |
| mozilla/geckoview | GeckoView is a set of components for embedding Gecko in Android apps | 513 | HTML |
| mozilla/vtt.js | A JavaScript implementation of the WebVTT specification | 507 | JavaScript |
| mozilla/notes | DEPRECATED - A notepad for Firefox | 500 | HTML |
| mozilla/neo | INACTIVE - http://mzl.la/ghe-archive - DEPRECATED: See https://neutrino.js.org for alternative | 500 | JavaScript |
| mozilla/FirefoxColor | Theming demo for Firefox Quantum and beyond | 489 | JavaScript |
| mozilla/cubeb | Cross platform audio library | 480 | C++ |
| mozilla/skywriter | Mozilla Skywriter | 480 | JavaScript |
| mozilla/zamboni | Backend for the Firefox Marketplace | 474 | Python |
| mozilla/firefox-translations-models | CPU-optimized Neural Machine Translation models for Firefox Translations | 462 | Ruby |
| mozilla/zilla-slab | Mozilla's Zilla Slab Type Family | 447 | Shell |
| mozilla/libdweb | Extension containing an experimental libdweb APIs | 444 | JavaScript |
| mozilla/mp4parse-rust | Parser for ISO Base Media Format aka video/mp4 written in Rust. | 440 | Rust |
| mozilla/glean | Modern cross-platform telemetry | 439 | Rust |
| mozilla/ssl-config-generator | Mozilla SSL Configuration Generator | 432 | JavaScript |
| mozilla/agithub | Agnostic Github client API -- An EDSL for connecting to REST servers | 430 | Python |
| mozilla/scanjs | [DEPRECATED] Static analysis tool for javascript code. | 428 | JavaScript |
| mozilla/pointer.js | INACTIVE - http://mzl.la/ghe-archive - INACTIVE - http://mzl.la/ghe-archive - Normalizes mouse/touch events into 'pointer' events. | 428 | JavaScript |
| mozilla/fxa-auth-server | DEPRECATED - Migrated to https://github.com/mozilla/fxa | 397 | JavaScript |
| mozilla/qbrt | CLI to a Gecko desktop app runtime | 394 | JavaScript |
| mozilla/r2d2b2g | Firefox OS Simulator is a test environment for Firefox OS. Use it to test your apps in a Firefox OS-like environment that looks and feels like a mobile phone. | 394 | JavaScript |
| mozilla/rust-code-analysis | Library to analyze and collect metrics on source code | 387 | Rust |
| mozilla/masche | Deprecated - MIG Memory Forensic library | 384 | Go |
| mozilla/valence | INACTIVE - http://mzl.la/ghe-archive - Firefox Developer Tools protocol adapters (Unmaintained) | 376 | JavaScript |
| mozilla/twemoji-colr | Twemoji font in COLR/CPAL layered format | 375 | JavaScript |