Governance

Overview

To add, remove, or update module information, see the mots documentation.

Mozilla operates under a module ownership governance system. A module is a discrete unit of code or activity. An owner is the person in charge of a module or sub-module. A peer is a person whom the owner has appointed to help them. A module may have multiple peers and, very occasionally, multiple owners.

The system is overseen by the owner and peers of the Module Ownership module. For the modules that make up Firefox, oversight is provided by the Firefox Technical Leadership module. Owners may add and remove peers from their modules as they wish, without reference to anyone else.

Modules

firefox-toplevel

The top level directory for the Firefox/Gecko tree. Owned by the TLMC

Owner(s)	Bobby Holley (bholley) Andrew Overholt (overholt) Dave Townsend (mossop) Ben Bangert (benbangert) Nick Alexander (nalexander) Nika Layzell (nika)
Owner(s) Emeritus	Brendan Eich, Kate Hudson
Includes	README.txt

Android Components

A collection of independent, reusable Android library components to make it easier to build browsers and browser-like applications.

Owner(s)	Jonathan Almeida (jonalmeida) Matt Tighe (matt-tighe)
Peer(s)	Kayacan Kaya (kaya)
Includes	mobile/android/android-components/**/*

Code Coverage

Tools for code coverage instrumentation, and coverage data parsing and management.

Owner(s)	Marco Castelluccio (marco)
Peer(s)	Calixte Denizet (calixte) Joel Maher (jmaher)
Includes	tools/code-coverage/**/* python/mozbuild/mozbuild/codecoverage/**/* testing/mozharness/mozharness/mozilla/testing/codecoverage.py
Bugzilla Components	Testing :: Code Coverage

Core: Accessibility

Support for platform accessibility APIs. Accessibility APIs are used by 3rd party software like screen readers, screen magnifiers, and voice dictation software, which need information about document content and UI controls, as well as important events like changes of focus.

Owner(s)	James Teh (Jamie)
Peer(s)	Eitan Isaacson (eeejay) Morgan Reschenberg (morgan) Nathan LaPré (nlapre)
Owner(s) Emeritus	Aaron Leventhal, Alexander Surkov
Peer(s) Emeritus	David Bolter, Trevor Saunders, Ginn Chen, Yan Evan, Yura Zenevich, Marco Zehe
Includes	accessible/**/*
Group	dev-accessibility
URL	https://developer.mozilla.org/docs/Web/Accessibility
Bugzilla Components	Core::Disability Access APIs

Core: Animation

Declarative animations: CSS animations, CSS transitions, Web Animations API, and off-main thread animations.

Owner(s)	Brian Birtles (birtles)
Peer(s)	Boris Chiou (boris) Hiroyuki Ikezoe (hiro)
Peer(s) Emeritus	Matt Woodrow
Includes	dom/animation/**/*
Group	dev-platform
Bugzilla Components	Core::DOM::Animation, Core::CSS Transitions and Animations

Core: Anti-Tracking

Tracking detection and content-blocking.

Owner(s)	Tim Huang (timhuang)
Peer(s)	Benjamin VanderSloot (bvandersloot) Dimi Lee (dlee) Paul Zühlcke (pbz)
Peer(s) Emeritus	Ehsan Akhgari, Erica Wright, Gary Chen, Andrea Marchesini, Johann Hofmann
Includes	toolkit/components/antitracking/**/*
Group	dev-platform
Bugzilla Components	Core::Privacy: Anti-Tracking

Core: APZ (Graphics submodule)

Asynchronous panning and zooming

Owner(s)	Botond Ballo (botond)
Peer(s)	Timothy Nikkel (tnikkel) Dan Robertson (dlrobertson) Hiroyuki Ikezoe (hiro) Markus Stange (mstange)
Owner(s) Emeritus	Kartikaya Gupta
Peer(s) Emeritus	Ryan Hunt
Includes	gfx/layers/apz/**/*
Group	dev-platform
URL	https://wiki.mozilla.org/Platform/GFX/APZ
Bugzilla Components	Core::Panning and Zooming

Core: Build and Release Tools

Tools related to build and release automation and configuration of release builds.

Owner(s)	Julien Cristau (jcristau)
Peer(s)	Heitor Neiva (hneiva) bhearsum (bhearsum) Gabriel Bustamante (gabriel)
Owner(s) Emeritus	Aki Sasaki
Includes	tools/update-packaging/**/* tools/update-verify/**/*
Group	release-engineering
URL	https://wiki.mozilla.org/ReleaseEngineering
Bugzilla Components	Release Engineering::*

Core: Build Config

The build system for Gecko and several mozilla.org hosted Gecko-based applications.

Owner(s)	Mike Hommey (glandium)
Peer(s)	Andi (andi) Alex Hochheiden (ahochheiden)
Owner(s) Emeritus	Chris Manchester, Gregory Szorc, Ted Mielczarek, Benjamin Smedberg
Peer(s) Emeritus	Ted Mielczarek, Ralph Giles, Gregory Szorc, Chris Manchester, Mike Shal, Nathan Froyd, Ricky Stewart, David Major, Mitchell Hentges
Includes	build/**/* config/**/* python/mozbuild/**/* browser/config/mozconfigs/**/*
Group	dev-builds
URL	Build System
Bugzilla Components	Core::Build Config

Core: Build Config - Fennec

Submodule of the build config covering Fennec’s build system in mobile/android.

Owner(s)	Nick Alexander (nalexander)
Includes	build/**/* config/**/* python/mozbuild/**/* browser/config/mozconfigs/**/*
Group	dev-builds
Bugzilla Components	Core::Build Config

Core: Build Config - Taskgraph

Support for task-graph generation in decision, action, and cron tasks, including configuration of all tasks including those for CI, nightlies, and releases; as well as Docker and VM images used to execute those tasks.

Owner(s)	Andrew Halberstadt (ahal)
Peer(s)	Mike Hommey (glandium) Julien Cristau (jcristau) Johan Lorenzo (jlorenzo) Joel Maher (jmaher)
Owner(s) Emeritus	Tom Prince
Peer(s) Emeritus	Dustin Mitchell, Aki Sasaki, Brian Stack, Gregory Szorc, Justin Wood
Includes	taskcluster
Bugzilla Components	Firefox Build System::Task Configuration

Core: Code Analysis and Debugging Tools

Tools for debugging Mozilla code or for analyzing speed, memory use, and other characteristics of it.

Warning

This module does not have any owners specified.

Owner(s) Emeritus	David Baron
Includes	tools/performance/**/* tools/rb/**/*
Group	dev-performance

Core: Content Security

Native content-based security features enforced in the ContentSecurityManager, including: Content Security Policy (CSP), Mixed Content Blocker (MCB), Referrer Policy, Subresource Integrity (SRI), Cross-Origin Resource Sharing (CORS), X-Frame-Options, X-Content-Type-Options: nosniff, HTTPS-Only-Mode, Sanitizer API, Sec-Fetch Metadata, and top-level data: URI blocking.

Owner(s)	Christoph Kerschbaumer (ckerschb)
Peer(s)	Daniel Veditz (dveditz) Frederik Braun (freddy) Tom Schuster (tschuster)
Peer(s) Emeritus	Sid Stamm, Jonas Sicking, Jonathan Kingston, Thomas Nguyen, François Marier, Tanvi Vyas, Andrea Marchesini
Includes	dom/security/**/*
Group	dev-security
Bugzilla Components	Core::DOM: Security

Core: Cookies

Owner(s)	Daniel Veditz (dveditz) Tim Huang (timhuang) Valentin Gosu (valentin)
Peer(s)	Ed Guloien (edgul) Paul Zühlcke (pbz) Tom Schuster (tschuster)
Owner(s) Emeritus	Monica Chew, Andrea Marchesini
Peer(s) Emeritus	Josh Matthews, Mike Connor, Dan Witte, Christian Biesinger, Shawn Wilsher, Ehsan Akhgari, Honza Bambas
Includes	netwerk/cookie/**/*
Group	dev-platform
Bugzilla Components	Core::Networking: Cookies

Core: Crash reporting

Infrastructure and tools used to generate, submit and process crash reports. This includes the in-tree google-breakpad fork, the crash report generation machinery as well as the host tools used to dump symbols, analyse minidumps and generate stack traces.

Owner(s)	Gabriele Svelto (gsvelto)
Peer(s)	Calixte Denizet (calixte) Alex Franchuk (afranchuk)
Peer(s) Emeritus	Aria Beingessner, Kris Wright
Includes	toolkit/crashreporter/**/* toolkit/components/crashes/**/* tools/crashreporter/**/* ipc/glue/CrashReporter* mobile/android/geckoview/src/main/java/org/mozilla/geckoview/CrashReporter.java
Group	dev-platform
URL	Crash Reporter
Bugzilla Components	Toolkit::Crash Reporting

Core: Credentials

API Surface for FedCM and WebAuthn

Owner(s)	Benjamin VanderSloot (bvandersloot) John Schanck (jschanck)
Peer(s)	Tim Huang (timhuang) Paul Zühlcke (pbz)
Includes	toolkit/components/credentialmanagement/**/* browser/components/credentialmanager/**/* dom/credentialmanagement/**/* dom/webauthn/**/*
Group	dev-platform
Bugzilla Components	Core::DOM: Credential Management, Core::DOM: Web Authentication

Core: C++/Rust usage, tools, and style

Aspects of C++ use such as language feature usage, standard library versions/usage, compiler/toolchain versions, formatting and naming style, and aspects of Rust use as needs arise

Owner(s)	Bobby Holley (bholley)
Peer(s)	Botond Ballo (botond) Mike Hommey (glandium)
Owner(s) Emeritus	Ehsan Akhgari
Peer(s) Emeritus	Jeff Walden, Simon Giesecke
Group	dev-platform
Bugzilla Components	Various

Core: Cycle Collector

Code to break and collect objects within reference cycles

Owner(s)	Andrew McCreight (mccr8)
Peer(s)	Peter Van der Beken (peterv) Olli Pettay (smaug)
Peer(s) Emeritus	David Baron
Includes	xpcom/base/nsCycleCollect*
Group	dev-platform
Bugzilla Components	Core::Cycle Collector

Core: DLL Services

Windows dynamic linker instrumentation and blocking

Owner(s)	David Parks (handyman)
Peer(s)	Greg Stoll (gstoll)
Owner(s) Emeritus	Aaron Klotz, Toshihito Kikuchi
Peer(s) Emeritus	Molly Howell
Includes	toolkit/xre/dllservices/**/*
Bugzilla Components	Core::DLL Services

Core: docshell

Owner(s)	Olli Pettay (smaug) Nika Layzell (nika)
Peer(s)	Peter Van der Beken (peterv) Andreas Farre (farre)
Owner(s) Emeritus	Boris Zbarsky
Peer(s) Emeritus	Johnny Stenback, Christian Biesinger, Justin Lebar, Samael Wang, Kyle Machulis
Includes	docshell/**/* uriloader/base/**/*
Group	dev-platform
Bugzilla Components	Core::DOM: Navigation

Core: Document Object Model

Owner(s)	Peter Van der Beken (peterv)
Peer(s)	Olli Pettay (smaug) Henri Sivonen (hsivonen) Bobby Holley (bholley) Andrea Marchesini (baku) Andrew McCreight (mccr8) Nika Layzell (nika) Andreas Farre (farre) Emilio Cobos Álvarez (emilio) Andrew Sutherland (asuth) Edgar Chen (edgar) Kagami (saschanaz) Sean Feng (sefeng)
Owner(s) Emeritus	Johnny Stenback
Peer(s) Emeritus	Justin Lebar, Jonas Sicking, Ben Turner, Mounir Lamouri, Kyle Huey, Bill McCloskey, Ben Kelly, Blake Kaplan, Kyle Machulis, Boris Zbarsky, Ehsan Akhgari
Includes	dom/**/*
Group	dev-tech-dom
URL	http://developer.mozilla.org/en/docs/DOM
Bugzilla Components	Core::DOM, Core::DOM: Core & HTML
Review Group	#dom-core

Core: DOM File

DOM Blob, File and FileSystem APIs

Owner(s)	Andrea Marchesini (baku)
Peer(s)	Olli Pettay (smaug)
Includes	dom/file/**/* dom/filesystem/**/*
Group	dev-platform
URL	http://developer.mozilla.org/en/docs/DOM
Bugzilla Components	Core::DOM: File

Core: DOM Streams

Streams Specification implementation

Owner(s)	Kagami (saschanaz)
Peer(s)	Olli Pettay (smaug) Tom S (evilpie) Matthew Gaudet (mgaudet)
Owner(s) Emeritus	Matthew Gaudet
Includes	dom/streams/**/*
Group	dev-platform
URL	http://developer.mozilla.org/en/docs/DOM
Bugzilla Components	Core::DOM: Streams

Core: Editor

Owner(s)	Masayuki Nakano (masayuki)
Peer(s)	Makoto Kato (m_kato)
Owner(s) Emeritus	Ehsan Akhgari
Includes	editor/**/*
Group	dev-platform
URL	Editor
Bugzilla Components	Core::Editor

Core: Event Handling

DOM Events and Event Handling

Owner(s)	Olli Pettay (smaug) Masayuki Nakano (masayuki)
Peer(s)	Edgar Chen (edgar)
Peer(s) Emeritus	Stone Shih
Includes	dom/events/**/*
Group	dev-platform
URL	http://developer.mozilla.org/en/docs/DOM
Bugzilla Components	Core::DOM: Events, Core::DOM: UI Events & Focus Handling

Core: Firefox Source Documentation

The infrastructure platform used to generate Firefox’s source documentation, excluding editorial control over the content.

Owner(s)	Andrew Halberstadt (ahal)
Peer(s)	Sylvestre Ledru (Sylvestre) Marco Castelluccio (marco)
Includes	docs/ tools/moztreedocs/
URL	https://firefox-source-docs.mozilla.org/
Bugzilla Components	Developer Infrastructure::Source Documentation

Core: Gecko Profiler

Gecko’s built-in profiler

Owner(s)	Markus Stange (mstange)
Peer(s)	Nazım Can Altınova (canova) Florian Quèze (florian) Julian Seward (jseward)
Owner(s) Emeritus	Benoit Girard
Peer(s) Emeritus	Shu-yu Guo (JS integration), Thinker Lee (TaskTracer), Cervantes Yu (TaskTracer), Nicholas Nethercote, Gerald Squelart, Kannan Vijayan, Beth Rennie, Greg Tatum
Includes	tools/profiler/**/* mozglue/baseprofiler/**/*
Group	dev-platform
URL	https://firefox-source-docs.mozilla.org/tools/profiler/
Bugzilla Components	Core::Gecko Profiler

Core: GeckoView

Framework for embedding Gecko into Android applications

Owner(s)	owlish
Peer(s)	Cathy Lu (calu) Makoto Kato (m_kato) Olivia Hall (olivia)
Owner(s) Emeritus	James Willcox, Agi Sferro
Peer(s) Emeritus	Dylan Roeh, Eugen Sawin, Aaron Klotz, Jim Chen, Randall E. Barker, Jon Almeida
Includes	mobile/android/**/* widget/android/**/* hal/android/**/*
Excludes	mobile/android/fenix/**/* mobile/android/focus-android/**/* mobile/android/android-components/**/*
URL	https://wiki.mozilla.org/Mobile/GeckoView
Bugzilla Components	GeckoView::General

Core: Global Key Bindings

Global hot keys for Firefox. Does not include underlined menu accelerators and the like, as those are part of i18n.

Owner(s)	Masayuki Nakano (masayuki)
Peer(s) Emeritus	Neil Rashbrook
Includes	dom/events/**/*
Group	dev-accessibility
URL	https://support.mozilla.org/kb/keyboard-shortcuts-perform-firefox-tasks-quickly
Bugzilla Components	Core::Keyboard: Navigation

Core: Graphics

Mozilla graphics API

Owner(s)	Jeff Muizelaar (jrmuizel)
Peer(s)	Nicolas Silva (nical) Kelsey Gilbert (jgilbert) Markus Stange (mstange) Bas Schouten (bas.schouten) Jonathan Kew (jfkthame) Sotaro Ikeda (sotaro) Jamie Nicol (jnicol) Glenn Watson (gw) Lee Salzman (lsalzman) Andrew Osmond (aosmond)
Owner(s) Emeritus	Robert O’Callahan
Peer(s) Emeritus	Benoit Girard(Compositor, Performance), Ali Juma, George Wright(Canvas2D), Mason Chang, David Anderson, Christopher Lord, John Daggett(text/fonts), Benoit Jacob(gfx/gl), Joe Drew, Vladimir Vukicevic, James Willcox(Android), Nick Cameron, Ryan Hunt
Includes	gfx/**/* dom/canvas/**/*
Group	dev-platform
URL	https://wiki.mozilla.org/Platform/GFX https://wiki.mozilla.org/Gecko:Layers https://wiki.mozilla.org/Gecko:2DGraphicsSketch
Bugzilla Components	Core::Graphics, Core::Graphics: Layers, Core::Graphics: Text, Core::Graphics: WebRender, Core::Graphics: Color Management, Core::Graphics: Canvas2D, Core::Graphics: CanvasWebGL

Core: HAL

Hardware Abstraction Layer

Owner(s)	Gabriele Svelto (gsvelto)
Includes	hal/**/*
Group	dev-platform
Bugzilla Components	Core::Hardware Abstraction Layer (HAL)

Core: HTML Parser

The HTML Parser transforms HTML source code into a DOM. It conforms to the HTML specification, and is mostly translated automatically from Java to C++.

Owner(s)	Henri Sivonen (hsivonen)
Peer(s)	William Chen (wchen)
Includes	parser/html/**/*
Group	dev-platform
URL	http://about.validator.nu/
Bugzilla Components	Core::HTML: Parser

Core: I18N Library

Owner(s)	Henri Sivonen (hsivonen) Jonathan Kew (jfkthame)
Peer(s)	Masatoshi Kimura (emk) Zibi Braniecki (zbraniecki) Makoto Kato (m_kato)
Owner(s) Emeritus	Jungshik Shin, Simon Montagu
Includes	intl/**/*
Group	dev-i18n
URL	Internationalization
Bugzilla Components	Core::Internationalization

Core: ImageLib

Owner(s)	Timothy Nikkel (tnikkel)
Peer(s)	Andrew Osmond (aosmond) Jeff Muizelaar (jrmuizel)
Peer(s) Emeritus	Seth Fowler, Brian Bondy, Justin Lebar
Includes	media/libjpeg/**/* media/libpng/**/* image/**/* modules/zlib/**/*
Group	dev-platform
Bugzilla Components	Core::ImageLib

Core: IndexedDB

Owner(s)	Jan Varga (janv)
Peer(s)	Andrew Sutherland (asuth) Jari Jalkanen (jjalkanen)
Owner(s) Emeritus	Ben Turner
Peer(s) Emeritus	Jonas Sicking, Kyle Huey, Bevis Tseng, Andrea Marchesini
Includes	dom/indexedDB/**/*
Group	dev-platform
URL	https://developer.mozilla.org/en/IndexedDB
Bugzilla Components	Core::DOM: IndexedDB
Review Group	#dom-storage-reviewers

Core: IPC

Native message-passing between threads and processes

Owner(s)	Nika Layzell (nika)
Peer(s)	Jed Davis (jld) Andrew McCreight (mccr8) David Parks (handyman)
Owner(s) Emeritus	Chris Jones, Bill McCloskey, Jed Davis
Peer(s) Emeritus	Benjamin Smedberg, Ben Turner, David Anderson, Kan-Ru Chen, Bevis Tseng, Ben Kelly, Jim Mathies
Includes	ipc/glue/**/* ipc/ipdl/**/* ipc/chromium/**/*
Group	dev-platform
Bugzilla Components	Core::IPC
Review Group	#ipc-reviewers

Core: JavaScript

JavaScript engine (SpiderMonkey)

Owner(s)	Jan de Mooij (jandem)
Peer(s)	Yoshi Cheng-Hao Huang (allstars.chh) André Bargull (anba) Tooru Fujisawa (arai) Bobby Holley (bholley) Bryan Thrall (bthrall) Dan Minor (dminor) Tom S (evilpie) Iain Ireland (iain) Jon Coppeard (jonco) Julian Seward (jseward) Matthew Gaudet (mgaudet) Nicolas B (nbp) Ryan Hunt (rhunt) Steve Fink (sfink) Ted Campbell (tcampbell) Yulia Startsev (yulia) Yury Delendik (yury)
Owner(s) Emeritus	Brendan Eich, Dave Mandelin, Luke Wagner, Jason Orendorff
Peer(s) Emeritus	Andreas Gal, Ashley Hauck, Bill McCloskey, Blake Kaplan, Brian Hackett, Caroline Cullen, Dan Gohman, David Anderson, Eddy Bruel, Eric Faust, Hannes Verschore, Igor Bukanov, Jeff Walden, Kannan Vijayan, Nicholas Nethercote, Nick Fitzgerald, Niko Matsakis, Shu-yu Guo, Till Schneidereit
Includes	js/src/**/*
URL	https://spidermonkey.dev/
Bugzilla Components	Core::JavaScript Engine, Core::JavaScript: GC, Core::JavaScript: Internationalization API, Core::JavaScript: Standard Library, Core::JavaScript: WebAssembly, Core::js-ctypes

Core: JavaScript JIT

JavaScript engine’s JIT compilers (IonMonkey, Baseline)

Owner(s)	Jan de Mooij (jandem)
Peer(s)	André Bargull (anba) Ted Campbell (tcampbell) Matthew Gaudet (mgaudet) Iain Ireland (iain) Nicolas B (nbp) Tom S (evilpie)
Peer(s) Emeritus	Benjamin Bouvier, Brian Hackett, Caroline Cullen, David Anderson, Hannes Verschore, Kannan Vijayan, Luke Wagner, Shu-yu Guo, Sean Stangl
Includes	js/src/jit/**/*
URL	https://spidermonkey.dev/
Bugzilla Components	Core::JavaScript Engine: JIT

Core: Layout Engine

rendering tree construction, layout (reflow), etc.

Owner(s)	Daniel Holbert (dholbert)
Peer(s)	Jonathan Kew (jfkthame) Timothy Nikkel (tnikkel) Xidorn Quan (xidorn) Emilio Cobos Álvarez (emilio) Ting-Yu Lin (TYLin) Jonathan Watt (jwatt)
Owner(s) Emeritus	David Baron
Peer(s) Emeritus	Matt Woodrow, Boris Zbarsky, Robert O’Callahan, Mats Palmgren
Includes	layout/**/* layout/base/**/* layout/build/**/* layout/forms/**/* layout/generic/**/* layout/printing/**/* layout/tables/**/* layout/tools/**/*
Group	dev-platform
URL	https://wiki.mozilla.org/Gecko:Overview#Layout
Bugzilla Components	Core::Layout, Core::Layout: Block and Inline, Core::Layout: Columns, Core::Layout: Flexbox, Core::Layout: Floats, Core::Layout: Form Controls, Core::Layout: Generated Content, Lists, and Counters, Core::Layout: Grid, Core::Layout: Images, Video, and HTML Frames, Core::Layout: Positioned, Core::Layout: Ruby, Core::Layout: Scrolling and Overflow, Core::Layout: Tables, Core::Layout: Text and Fonts, Core::Print Preview, Core::Printing: Output

Core: Legacy HTML Parser

Warning

This module does not have any owners specified.

Peer(s)	Peter Van der Beken (peterv) rbs
Owner(s) Emeritus	Blake Kaplan
Peer(s) Emeritus	Johnny Stenback, David Baron
Includes	parser/htmlparser/**/*
URL	http://www.mozilla.org/newlayout/doc/parser.html
Bugzilla Components	Core::HTML: Parser

Core: libjar

The JAR handling code (protocol handler, stream implementation, and zipreader/zipwriter).

Owner(s)	Valentin Gosu (valentin)
Peer(s)	Kershaw Chang (kershaw) Randell Jesup (jesup)
Owner(s) Emeritus	Taras Glek, Michael Wu, Aaron Klotz
Peer(s) Emeritus	Michal Novotny
Includes	modules/libjar/**/*
Group	dev-platform
Bugzilla Components	Core::Networking: JAR

Core: Machine Learning

AI services and local inference

Owner(s)	Ed Lee (Mardak) Tarek Ziadé (tarek)
Peer(s)	Greg Tatum (gregtatum)
Includes	browser/components/genai/ toolkit/components/aboutinference/ toolkit/components/ml/
Bugzilla Components	Core::Machine Learning

Core: MathML

MathML is a low-level specification for describing mathematics which provides a foundation for the inclusion of mathematical expressions in Web pages.

Owner(s)	Emilio Cobos Álvarez (emilio)
Peer(s)	Frédéric Wang (fred.wang) Jonathan Kew (jfkthame)
Owner(s) Emeritus	Karl Tomlinson
Peer(s) Emeritus	Robert O’Callahan
Includes	layout/mathml/**/*
Group	dev-tech-mathml
URL	https://developer.mozilla.org/docs/Web/MathML
Bugzilla Components	Core::MathML

Core: Media Playback

HTML Media APIs, including Media Source Extensions and non-MSE video/audio element playback, and Encrypted Media Extensions. (WebRTC and WebAudio not included).

Warning

This module does not have any owners specified.

Peer(s)	Matthew Gregan (kinetik) John Lin (jhlin) Alastor Wu (alwu) Paul Adenot (padenot) C (chunmin)
Owner(s) Emeritus	Robert O’Callahan, Chris Pearce, Jean-Yves Avenard
Includes	dom/media/**/* media/gmp-clearkey/**/* media/libcubeb/**/* media/libnestegg/**/* media/libogg/**/* media/libopus/**/* media/libtremor/**/* media/libvorbis/**/* media/libvpx/**/* dom/media/platforms/omx/**/* dom/media/gmp/rlz/**/*
Group	dev-media
Bugzilla Components	Core::Audio/Video

Core: Media Transport

Pluggable transport for real-time media

Warning

This module does not have any owners specified.

Peer(s)	Byron Campen (bwc) nohlmeier
Owner(s) Emeritus	Eric Rescola
Peer(s) Emeritus	Adam Roach
Includes	dom/media/webrtc/transport/**/*
Group	dev-media
Bugzilla Components	Core::WebRTC::Networking

Core: Memory Allocator

Most things related to memory allocation in Gecko, including jemalloc, replace- malloc, DMD (dark matter detector), logalloc, etc.

Owner(s)	Mike Hommey (glandium)
Peer(s)	Paul Bone (pbone)
Peer(s) Emeritus	Eric Rahm, Nicholas Nethercote
Includes	memory/**/*
Group	dev-platform
Bugzilla Components	Core::DMD, Core::jemalloc

Core: mfbt

mfbt is a collection of headers, macros, data structures, methods, and other functionality available for use and reuse throughout all Mozilla code (including SpiderMonkey and Gecko more broadly).

Owner(s)	Mike Hommey (glandium)
Owner(s) Emeritus	Jeff Walden
Peer(s) Emeritus	Ms2ger
Includes	mfbt/**/*
Group	dev-platform
Bugzilla Components	Core::MFBT

Core: Moz2D (Graphics submodule)

Platform independent 2D graphics API

Owner(s)	Bas Schouten (bas.schouten)
Peer(s)	Jeff Muizelaar (jrmuizel) Jonathan Watt (jwatt)
Includes	gfx/2d/**/*
Group	dev-platform
URL	https://wiki.mozilla.org/Platform/GFX/Moz2D
Bugzilla Components	Core::Graphics

Core: Mozglue

Glue library containing various low-level functionality, including a dynamic linker for Android, a DLL block list for Windows, etc.

Owner(s)	Mike Hommey (glandium)
Peer(s)	jchen
Peer(s) Emeritus	Kartikaya Gupta (mozglue/android)
Includes	mozglue/**/*
Group	dev-platform
Bugzilla Components	Core::mozglue

Core: MSCOM

Integration with Microsoft Distributed COM

Owner(s)	David Parks (handyman)
Peer(s)	James Teh (Jamie) Nick Rishel (nrishel)
Owner(s) Emeritus	Aaron Klotz, James Teh
Peer(s) Emeritus	Jim Mathies
Includes	ipc/mscom/**/*
Group	dev-platform
Bugzilla Components	Core::IPC: MSCOM

Core: Necko

The Mozilla Networking Library

Owner(s)	Valentin Gosu (valentin)
Peer(s)	Kershaw Chang (kershaw) Randell Jesup (jesup)
Owner(s) Emeritus	Dragana Damjanovic, Patrick McManus, Christian Biesinger
Peer(s) Emeritus	Michal Novotny, Honza Bambas, Shih-Chiang Chien, Boris Zbarsky, Steve Workman, Nick Hurley, Daniel Stenberg, Jason Duell, Junior Hsu
Includes	netwerk/**/* netwerk/base/**/* netwerk/build/**/* netwerk/cache2/**/* netwerk/dns/**/* netwerk/locales/**/* netwerk/mime/**/* netwerk/protocol/**/* netwerk/socket/**/* netwerk/streamconv/**/* netwerk/system/**/* netwerk/test/**/* dom/fetch/**/* dom/xhr/**/* dom/network/**/* dom/websocket/**/* uriloader/prefetch/**/* uriloader/preload/**/*
Group	dev-tech-network
URL	Networking
Bugzilla Components	Core::Networking, Core::Networking: Cache, Core::Networking: Cookies, Core::Networking: File, Core::Networking: HTTP, Core::Networking: JAR, Core::Networking: Proxy, Core::Networking: Websockets, Core::DOM: Networking

Core: NodeJS usage, tools, and style

Advises on the use of NodeJS and npm packages at build and runtime. Reviews additions/upgrades/removals of vendored npm packages. Works with appropriate teams to maintain automated license and security audits of npm packages. Works with the security team and relevant developers to respond to vulnerabilities in NodeJS and vendored npm packages.

Owner(s)	Dan Mosedale (dmosedale)
Peer(s)	Mark Banner (standard8) Danny Coates (dcoates) Ed Lee (Mardak) Dave Townsend (mossop)
Peer(s) Emeritus	Kate Hudson
Includes	package.json package-lock.json node_modules/**/*
URL	https://wiki.mozilla.org/Firefox/firefox-dev, #nodejs on slack
Bugzilla Components	Various

Core: Notifications

The infrastructure for Web Notifications API and the Firefox Desktop notifications.

Owner(s)	Kagami (saschanaz)
Peer(s)	Nick Alexander (nalexander) Nick Rishel (nrishel)
Includes	dom/notification/**/* toolkit/components/alerts/**/* toolkit/system/gnome/nsAlertsIconListener* toolkit/system/gnome/nsSystemAlertsService* widget/windows/ToastNotification* widget/cocoa/OSXNotificationCenter*
Group	dev-platform
Bugzilla Components	Core::DOM: Notifications, Toolkit::Alerts Service

Core: NSPR

Netscape Portable Runtime

Owner(s)	Kai Engert (KaiE)
Peer(s)	Mike Hommey (glandium)
Owner(s) Emeritus	Wan-Teh Chang
Includes	nsprpub/**/*
Group	dev-tech-nspr
URL	NSPR
Bugzilla Components	NSPR

Core: PDF

Rendering code to display documents encoded in the ISO 32000-1 PDF format.

Owner(s)	Calixte Denizet (calixte)
Peer(s)	Marco Castelluccio (marco)
Owner(s) Emeritus	Brendan Dahl
Peer(s) Emeritus	Artur Adib, Vivien Nicolas
Includes	toolkit/components/pdfjs/**/*
Group	dev-platform
URL	https://github.com/mozilla/pdf.js
Bugzilla Components	Core::PDF

Core: Permissions

Owner(s)	Tim Huang (timhuang)
Peer(s)	Paul Zühlcke (pbz)
Owner(s) Emeritus	Monica Chew, Ehsan Akhgari
Peer(s) Emeritus	Josh Matthews, Mike Connor, Dan Witte, Christian Biesinger, Shawn Wilsher, Honza Bambas, Andrea Marchesini, Johann Hofmann
Includes	extensions/permissions/**/*
Group	dev-platform
Bugzilla Components	Core :: Permission Manager
Review Group	#permissions-reviewers

Core: Plugins

NPAPI Plugin support.

Owner(s)	David Parks (handyman)
Owner(s) Emeritus	Jim Mathies
Peer(s) Emeritus	Josh Aas, John Schoenick, Robert O’Callahan, Johnny Stenback, Benjamin Smedberg
Includes	dom/plugins/**/*
URL	https://wiki.mozilla.org/Plugins
Bugzilla Components	Core::Plug-ins

Core: Preferences

Preference library

Warning

This module does not have any owners specified.

Peer(s)	Mike Hommey (glandium)
Owner(s) Emeritus	Nicholas Nethercote, Kris Wright
Peer(s) Emeritus	Felipe Gomes, Eric Rahm
Includes	modules/libpref/**/*
Group	dev-platform
Bugzilla Components	Core::Preferences: Backend

Core: Private Browsing

Implementation of the Private Browsing mode, and the integration of other modules with Private Browsing APIs.

Owner(s)	Tim Huang (timhuang)
Peer(s)	Tim Huang (timhuang)
Owner(s) Emeritus	Ehsan Akhgari, Johann Hofmann
Peer(s) Emeritus	Josh Matthews
Group	dev-platform
URL	https://wiki.mozilla.org/Private_Browsing
Bugzilla Components	Firefox::Private Browsing

Core: Privilege Manager

Caps is the capabilities-based security system.

Owner(s)	Bobby Holley (bholley)
Peer(s)	Christoph Kerschbaumer (ckerschb)
Peer(s) Emeritus	Boris Zbarsky, Brendan Eich, Johnny Stenback, Dan Veditz
Includes	caps/**/*
Group	dev-tech-dom
URL	http://www.mozilla.org/projects/security/components/index.html
Bugzilla Components	Core::Security: CAPS

Core: Push Subscriptions

Push is a way for application developers to send messages to their web applications.

Warning

This module does not have any owners specified.

Owner(s) Emeritus	Doug Turner, Lina Cambridge
Peer(s) Emeritus	Nikhil Marathe, Dragana Damjanovic, Martin Thomson
Includes	dom/push/**/* dom/interfaces/push/**/*
Bugzilla Components	Core::DOM: Push Subscriptions

Core: Sandboxing (Linux)

Sandboxing for the Linux platform

Owner(s)	Jed Davis (jld)
Peer(s)	Gian-Carlo Pascutto (gcp)
Includes	security/sandbox/linux/**/*
Group	dev-platform
URL	https://wiki.mozilla.org/Security/Sandbox
Bugzilla Components	Core::Security: Process Sandboxing

Core: Sandboxing (OSX)

Sandboxing for the OSX platform

Owner(s)	Haik Aftandilian (haik)
Includes	security/sandbox/mac/**/*
Group	dev-platform
URL	https://wiki.mozilla.org/Security/Sandbox
Bugzilla Components	Core::Security: Process Sandboxing

Core: Sandboxing (Windows)

Sandboxing for the Windows platform

Owner(s)	Bob Owen (bobowen)
Peer(s)	David Parks (handyman)
Owner(s) Emeritus	Tim Abraldes
Peer(s) Emeritus	Brian Bondy, Aaron Klotz, Jim Mathies, Toshihito Kikuchi
Includes	security/sandbox/win/**/*
Group	dev-platform
URL	https://wiki.mozilla.org/Security/Sandbox
Bugzilla Components	Core::Security: Process Sandboxing

Core: security

Crypto/PKI code, including NSS (Network Security Services) and JSS (NSS for Java)

Owner(s)	Benjamin Beurdouche (beurdouche) Robert Relyea (rrelyea) Martin Thomson (mt)
Peer(s)	Kai Engert (KaiE) Ryan Sleevi (ryan.sleevi) Eric Rescorla (ekr) Daiki Ueno (ueno) Anna Weine (nkulatova) Dennis Jackson (djackson) John Schanck (jschanck)
Owner(s) Emeritus	Wan-Teh Chang, Tim Taubert, J.C. Jones
Peer(s) Emeritus	Elio Maldonado, Franziskus Kiefer, Kevin Jacobs
Includes	security/nss/**/*
Group	dev-tech-crypto
URL	Network Security Services (NSS)
Bugzilla Components	NSS, JSS, Core::Security, Core::Security: S/MIME

Core: Security - Mozilla PSM Glue

Personal Security Manager

Owner(s)	Dana Keeler (keeler)
Peer(s)	John Schanck (jschanck)
Owner(s) Emeritus	Kai Engert (2001-2012)
Peer(s) Emeritus	Honza Bambas, Cykesiopka, Franziskus Kiefer
Includes	security/manager/**/*
Group	dev-tech-crypto
Bugzilla Components	Core::Security: PSM

Security - RLBox

Sandboxing using WASM/RLBox libraries.

Owner(s)	Shravan Narayan (shravanrn)
Peer(s)	Mike Hommey (glandium) Tom Ritter (tjr) Deian Stefan (deian)
Includes	security/rlbox third_party/rlbox third_party/rlbox_wasm2c_sandbox
Bugzilla Components	Core::Security: RLBox

Core: Static analysis & rewriting for C++

Tools for checking C++ code looking for problems at compile time, plus tools for automated rewriting of C++ code.

Owner(s)	Andi (andi)
Peer(s)	Nika Layzell (nika) Steve Fink (sfink) Jeff Muizelaar (jrmuizel)
Peer(s) Emeritus	Birunthan Mohanathas, Ehsan Akhgari
Includes	build/clang-plugin/**/* tools/rewriting/**/*
Group	dev-platform
Bugzilla Components	Core::Rewriting & Analysis

Core: SQLite and Embedded Database Bindings

Embedded database engines and their code bindings.

Owner(s)	Marco Bonardo (mak)
Peer(s)	Andrew Sutherland (asuth) Jan Varga (janv) Lina Butler (lina)
Owner(s) Emeritus	Shawn Wilsher
Includes	storage/**/* third_party/sqlite3/**/* toolkit/components/kvstore/**/* toolkit/modules/Sqlite.sys.mjs
Group	dev-platform
URL	https://firefox-source-docs.mozilla.org/storage/index.html
Bugzilla Components	Core::SQLite and Embedded Database Bindings

Core: String

Warning

This module does not have any owners specified.

Owner(s) Emeritus	David Baron
Peer(s) Emeritus	Eric Rahm
Includes	xpcom/string/**/*
Group	dev-tech-xpcom
URL	String Guide
Bugzilla Components	Core::String

Core: Style System

CSS style sheet handling; style data computation

Owner(s)	Emilio Cobos Álvarez (emilio)
Peer(s)	Bobby Holley (bholley) Xidorn Quan (xidorn) Boris Chiou (boris) David Shin (dshin) Tiaan Louw (tlouw) Zach Hoffman (zrhoffman)
Owner(s) Emeritus	David Baron, Cameron McCormack
Peer(s) Emeritus	Boris Zbarsky
Includes	layout/style/**/* servo/**/*
Group	dev-platform
URL	https://wiki.mozilla.org/Gecko:Overview#Style_System
Bugzilla Components	Core::CSS Parsing and Computation, Core::DOM: CSS Object Model

Core: Supply Chain

Policy management for third-party Rust dependencies

Owner(s)	Bobby Holley (bholley)
Peer(s)	Nika Layzell (nika) Tom Ritter (tjr)
Peer(s) Emeritus	Aria Beingessner
Includes	supply-chain/**/*
Group	dev-platform
Bugzilla Components	Firefox Build System::General

Core: SVG

Scalable Vector Graphics

Owner(s)	Jonathan Watt (jwatt)
Peer(s)	Robert Longson (longsonr) Daniel Holbert (dholbert) Brian Birtles (birtles)
Peer(s) Emeritus	Robert O’Callahan
Includes	dom/svg/**/* layout/svg/**/* dom/smil/**/*
Group	dev-tech-svg
URL	https://developer.mozilla.org/docs/Web/SVG
Bugzilla Components	Core::SVG

Core: UA String

User Agent String

Owner(s)	Tantek Çelik (tantek)
Peer(s)	Chris Peterson (cpeterson) Henri Sivonen (hsivonen)
Includes	netwerk/protocol/http/**/*
Group	dev-platform
URL	https://developer.mozilla.org/docs/Web/HTTP/Headers/User-Agent/Firefox
Bugzilla Components	Core::Networking: HTTP

Core: View System

The View Manager is responsible for handling “heavyweight” rendering (some clipping, compositing) and event handling tasks.

Owner(s)	Timothy Nikkel (tnikkel)
Peer(s)	Markus Stange (mstange)
Owner(s) Emeritus	Robert O’Callahan
Peer(s) Emeritus	David Baron, Boris Zbarsky
Includes	view/**/*
Group	dev-platform
Bugzilla Components	Core::Layout: View Rendering

Core: Web Audio

Support for the W3C Web Audio API specification.

Owner(s)	Paul Adenot (padenot)
Peer(s)	Karl Tomlinson (karlt)
Owner(s) Emeritus	Ehsan Akhgari
Peer(s) Emeritus	Robert O’Callahan
Includes	dom/media/webaudio/**/*
Group	dev-platform
URL	https://wiki.mozilla.org/Web_Audio_API
Bugzilla Components	Core::Web Audio

Core: Web Painting

painting, display lists, and layer construction

Warning

This module does not have any owners specified.

Peer(s)	Timothy Nikkel (tnikkel) Markus Stange (mstange) Miko Mynttinen (mikokm) Jamie Nicol (jnicol)
Owner(s) Emeritus	Matt Woodrow
Peer(s) Emeritus	David Baron, Robert O’Callahan
Includes	layout/painting/**/*
Group	dev-platform
URL	Layout & CSS
Bugzilla Components	Core::Layout: Web Painting

Core: Web Workers

Owner(s)	Andrew Sutherland (asuth)
Peer(s)	Eden Chuang (edenchuang) Jens Stutte (jstutte) Olli Pettay (smaug)
Owner(s) Emeritus	Ben Turner, Andrea Marchesini
Peer(s) Emeritus	Blake Kaplan, Jonas Sicking, Kyle Huey, Ben Kelly, Yaron Tausky
Includes	dom/serviceworkers/**/* dom/workers/**/*
Group	dev-platform
URL	https://developer.mozilla.org/docs/Web/API/Web_Workers_API/Using_web_workers
Bugzilla Components	Core::DOM: Workers
Review Group	#dom-worker-reviewers

Core: WebGPU (Graphics submodule)

WebGPU implementation

Owner(s)	Jim Blandy (jimb)
Peer(s)	Erich Gubler (ErichDonGubler) Kelsey Gilbert (jgilbert) Nicolas Silva (nical) Teodor Tanasoaia (teoxoy)
Owner(s) Emeritus	Dzmitry Malyshau
Peer(s) Emeritus	Josh Groves
Includes	dom/webidl/WebGPU.webidl dom/webgpu/**/* gfx/wgpu_bindings/**/* third_party/rust/naga/**/* third_party/rust/wgpu-core/**/* third_party/rust/wgpu-hal/**/* third_party/rust/wgpu-types/**/* testing/web-platform/tests/webgpu/**/* testing/web-platform/meta/webgpu/**/* testing/web-platform/mozilla/tests/webgpu/**/* testing/web-platform/mozilla/meta/webgpu/**/*
Group	dev-platform
URL	https://wiki.mozilla.org/Platform/GFX/WebGPU
Bugzilla Components	Core::Graphics::WebGPU
Review Group	#webgpu-reviewers

Core: WebRTC

WebRTC is responsible for realtime audio and video communication, as well as related issues like low-level camera and microphone access

Owner(s)	Randell Jesup (jesup)
Peer(s)	Byron Campen (bwc)
Peer(s) Emeritus	Ethan Hugg, Eric Rescola, Adam Roach
Includes	netwerk/sctp/**/*
Group	dev-media
URL	https://wiki.mozilla.org/Media/webrtc
Bugzilla Components	Core::WebRTC, Core::WebRTC Networking

Core: WebVR

Gecko’s implementation of WebVR (Virtual Reality) functionality, including API, devices, graphics and integration

Owner(s)	kip
Peer(s)	Daosheng Mu (daoshengmu)
Peer(s) Emeritus	Vladimir Vukicevic, Imanol Fernández
Includes	dom/vr/**/* gfx/vr/**/*
Group	dev-platform
URL	https://mozvr.com/
Bugzilla Components	Core::WebVR

Core: WebRTC Media

Submodule of WebRTC responsible for access to media input devices (microphones, cameras, screen capture), as well as realtime audiovisual codecs and packetization.

Owner(s)	Randell Jesup (jesup)
Peer(s)	Jan-Ivar Bruaroey (jib) Dan Minor (dminor) Andreas Pehrson (pehrsons)
Peer(s) Emeritus	Paul Kerr, Ethan Hugg
Includes	media/webrtc/**/* dom/media/webrtc/**/* dom/media/systemservices/**/*
Group	dev-media
URL	https://wiki.mozilla.org/Media/webrtc
Bugzilla Components	Core::WebRTC (Audio/Video)

Core: WebRTC Signaling

Submodule of WebRTC responsible for implementation of PeerConnection API, WebRTC identity, and SDP/JSEP handling

Owner(s)	Byron Campen (bwc)
Peer(s)	Randell Jesup (jesup)
Peer(s) Emeritus	Ethan Hugg, Eric Rescola, Adam Roach, nohlmeier
Includes	media/webrtc/signaling/**/*
Group	dev-media
URL	https://wiki.mozilla.org/Media/webrtc
Bugzilla Components	Core::WebRTC (Signaling)

Core: Widget

Top level Widget

Owner(s)	Stephen A Pohl (spohl)
Owner(s) Emeritus	Vladimir Vukicevic, Robert O’Callahan, Jim Mathies
Peer(s) Emeritus	Stuart Parmenter
Includes	widget/**/*
Group	dev-platform
Bugzilla Components	Core::Drag and Drop, Core::Widget, Core::Printing: Setup

Core: Widget - Android

This is part of the [https://wiki.mozilla.org/Modules/Core#GeckoView GeckoView] module.

Owner(s)	agi

Core: Widget - GTK

GTK widget support

Owner(s)	Karl Tomlinson (karlt)
Peer(s)	Martin Stránský (stransky) Emilio Cobos Álvarez (emilio)
Owner(s) Emeritus	Robert O’Callahan
Includes	widget/gtk/**/*
Group	dev-platform
URL	http://www.mozilla.org/ports/gtk/
Bugzilla Components	Core::Widget: Gtk

Core: Widget - Headless

Headless widget support

Warning

This module does not have any owners specified.

Owner(s) Emeritus	Brendan Dahl
Includes	widget/headless/**/*
Group	dev-platform
Bugzilla Components	Firefox::Headless

Core: Widget - macOS

macOS widget support

Owner(s)	Stephen A Pohl (spohl)
Peer(s)	Markus Stange (mstange) Haik Aftandilian (haik)
Owner(s) Emeritus	Robert O’Callahan, Markus Stange
Peer(s) Emeritus	Josh Aas, Benoit Girard, Steven Michaud
Includes	widget/cocoa/**/*
Group	dev-platform
Bugzilla Components	Core::Widget: Cocoa

Core: Widget - Windows

Windows widget support

Owner(s)	Chris Martin (cmartin)
Peer(s)	David Parks (handyman) Molly Howell (molly)
Owner(s) Emeritus	Jim Mathies
Peer(s) Emeritus	Rob Strong, Vladimir Vukicevic, Brad Lassey, Brian Bondy, Christian Biesinger, Doug Turner, Josh ‘timeless’ Soref, Rob Arnold, Aaron Klotz, Neil Rashbrook, Toshihito Kikuchi
Includes	widget/windows/**/*
Group	dev-platform
Bugzilla Components	Core::Widget: Win32

Core: XML

XML in Mozilla, including XML, XHTML, Namespaces in XML, Associating Style Sheets with XML Documents, XML Linking and XML Extras. XML-related things that are not covered by more specific projects.

Owner(s)	Peter Van der Beken (peterv)
Peer(s) Emeritus	Jonas Sicking, Johnny Stenback, Boris Zbarsky, Eric Rahm
Includes	dom/xml/**/* parser/expat/**/*
Group	dev-tech-xml
Bugzilla Components	Core::XML

Core: XPApps

Cross-Platform Applications, mostly Navigator front end and application shell.

Warning

This module does not have any owners specified.

Peer(s)	deanis74
Owner(s) Emeritus	Neil Rashbrook
Peer(s) Emeritus	Josh ‘timeless’ Soref
Includes	xpfe/**/*
Group	dev-apps-seamonkey

Core: XPCOM

The cross-platform object model and core data structures.

Owner(s)	Nika Layzell (nika)
Peer(s)	Kris Maglione (kmag) Beth Rennie (beth) Jens Stutte (jstutte) Andrew McCreight (mccr8) Emilio Cobos Álvarez (emilio)
Owner(s) Emeritus	Benjamin Smedberg
Peer(s) Emeritus	Doug Turner, Eric Rahm, Simon Giesecke, Kris Wright
Includes	startupcache/**/* xpcom/**/* xpcom/base/**/* xpcom/build/**/* xpcom/components/**/* xpcom/docs/**/* xpcom/ds/**/* xpcom/glue/**/* xpcom/reflect/**/* xpcom/rust/**/* xpcom/system/**/* xpcom/tests/**/* xpcom/threads/**/* xpcom/windbgdlg/**/*
Group	dev-platform
URL	XPCOM
Bugzilla Components	Core::XPCOM
Review Group	#xpcom-reviewers

Core: XPConnect

Deep Magic

Owner(s)	Bobby Holley (bholley)
Peer(s)	Peter Van der Beken (peterv) Andrew McCreight (mccr8) Kris Maglione (kmag) Nika Layzell (nika)
Peer(s) Emeritus	Boris Zbarsky, Blake Kaplan, Andreas Gal, Johnny Stenback, Gabor Krizsanits
Includes	js/xpconnect/**/*
Bugzilla Components	Core::XPConnect

Core: XPIDL

Cross-platform IDL compiler; produces .h C++ header files and .xpt runtime type description files from .idl interface description files.

Owner(s)	Nika Layzell (nika)
Peer(s)	Andrew McCreight (mccr8)
Owner(s) Emeritus	Kyle Huey
Peer(s) Emeritus	Mike Shaver, Josh ‘timeless’ Soref
Includes	xpcom/idl-parser/**/* xpcom/xpidl/**/*
Group	dev-tech-xpcom
URL	XPIDL

Core: XSLT Processor

XSLT transformations processor

Owner(s)	Peter Van der Beken (peterv)
Peer(s) Emeritus	Jonas Sicking, Axel Hecht, Eric Rahm
Includes	dom/xslt/**/*
Group	dev-tech-xslt
URL	https://developer.mozilla.org/docs/Web/XSLT
Bugzilla Components	Core::XSLT

Desktop Firefox

Standalone Web Browser.

Owner(s)	Dave Townsend (mossop) Gijs
Peer(s)	Dão Gottwald (dao) Marco Bonardo (mak) Mike Conley (mconley) Sarah Clements (sclements)
Peer(s) Emeritus	Brian Bondy, Lina Cambridge, Luke Chang, Ricky Chien, Justin Dolske, Georg Fritzsche, Felipe Gomes, Tim Guan-tin Chien, Johann Hofmann, Molly Howell, KM Lee Rex, Fred Lin, Ray Lin, Fischer Liu, Bill McCloskey, Mark Mentovai, Ted Mielczarek, Brian Nicholson, Matthew Noorenberghe, Neil Rashbrook, Asaf Romano, Marina Samuel, J Ryan Stinnett, Gregory Szorc, Tim Taubert, Jared Wein
Includes	browser/**/* toolkit/**/*
Group	firefox-dev
Bugzilla Components	Firefox, Toolkit

Add-ons Manager

Extension management back-end.

Owner(s)	scaraveo Luca Greco (rpl)
Peer(s)	Luca Greco (rpl) Tomislav Jovanovic (zombie) Rob Wu (robwu) William Durand (willdurand)
Owner(s) Emeritus	Robert Strong, Andrew Swan, Kris Maglione
Includes	toolkit/mozapps/extensions/**/*

Add-ons Manager UI

about:addons.

Owner(s)	scaraveo Mark Striemer (mstriemer)
Peer(s)	Luca Greco (rpl) Tomislav Jovanovic (zombie) Rob Wu (robwu) William Durand (willdurand)
Owner(s) Emeritus	Robert Strong, Andrew Swan
Includes	toolkit/mozapps/extensions/content/**/*

Address Bar

The address bar and address bar autocomplete.

Owner(s)	Drew Willcoxon (adw)
Peer(s)	Daisuke Akatsuka (daisuke) Dão Gottwald (dao) Marco Bonardo (mak) Mark Banner (standard8) James Teow (jteow)
Includes	browser/components/urlbar/**/* browser/themes/shared/urlbar*
Bugzilla Components	Firefox::Address Bar
Review Group	#urlbar-reviewers

Application Update

The application update services.

Owner(s)	Robin Steuber (bytesized)
Peer(s)	Molly Howell (molly)
Peer(s) Emeritus	Adam Gashlin
Includes	toolkit/mozapps/update/**/*

Bookmarks & History

The bookmarks and history services (Places).

Owner(s)	Marco Bonardo (mak)
Peer(s)	Drew Willcoxon (adw) Daisuke Akatsuka (daisuke) Lina Butler (lina) Mark Banner (standard8)
Owner(s) Emeritus	Dietrich Ayala
Peer(s) Emeritus	Asaf Romano, David Dahl, Shawn Wilsher
Includes	browser/components/places/**/* toolkit/components/places/**/*
Bugzilla Components	Firefox::Bookmarks & History, Toolkit::Places
Review Group	#places-reviewers

Desktop Theme

The style rules used in the desktop UI.

Owner(s)	Dão Gottwald (dao)
Peer(s)	Cieara Meador (cmkm) Emilio Cobos Álvarez (emilio) Hanna Jones (hjones) Itiel (itiel_yn8) Jules Simplicio (jules) Kelly Cochrane (kcochrane) Sam Foster (sfoster)
Peer(s) Emeritus	Tim Nguyen, Amy Churchwell
Includes	browser/themes/**/* toolkit/themes/**/*
Bugzilla Components	Firefox::Theme, Toolkit::Themes

Desktop UI

The main browser UI except where covered by more specific submodules.

Owner(s)	Mike Conley (mconley)
Peer(s)	Jared Hirsch (jhirsch) Sarah Clements (sclements) DJ (dwalker) Cieara Meador (cmkm)
Owner(s) Emeritus	Jared Wein
Peer(s) Emeritus	Florian Quèze
Includes	browser/base/content/**/*

Download Manager

The downloads UI and service.

Owner(s)	Marco Bonardo (mak)
Peer(s)	Gijs
Owner(s) Emeritus	Paolo Amadini, Shawn Wilsher
Peer(s) Emeritus	Micah Tigley
Includes	browser/components/downloads/**/* toolkit/mozapps/downloads/**/* uriloader/exthandler/**/*

Enterprise Policies

System policies for controlling Firefox.

Owner(s)	Mike Kaply (mkaply)
Includes	browser/components/enterprisepolicies/**/*

Experiments/Rollouts

Desktop clients for our experiments and off-train deployments systems.

Owner(s)	Beth Rennie (beth)
Peer(s)	Gijs Emily McMinn (emcminn) Charlie Humphreys (jeddai)
Owner(s) Emeritus	Michael Cooper
Includes	toolkit/components/normandy/**/* toolkit/components/nimbus/**/*
URL	https://experimenter.info/
Bugzilla Components	Firefox::Normandy, Firefox::Nimbus Desktop Client

Firefox View

The Firefox View page and its modules.

Owner(s)	Sarah Clements (sclements)
Peer(s)	Sam Foster (sfoster) Kelly Cochrane (kcochrane) Jonathan Sudiaman (jsudiaman)
Includes	browser/components/firefoxview/**/*

Form Autofill

Form detection and autocomplete.

Owner(s)	Sergey Galich (serg)
Peer(s)	Tim Giles (tgiles) Dimi Lee (dlee)
Owner(s) Emeritus	Matthew Noorenberghe
Includes	browser/extensions/formautofill/**/* toolkit/components/satchel/**/*

In-product Messaging

The system for delivering in-product messaging and onboarding including Activity Stream Router, about:welcome, UI tour.

Owner(s)	Punam Dahiya (pdahiya)
Peer(s)	Nan Jiang (nanj) Ed Lee (Mardak) Dan Mosedale (dmosedale) Shane Hughes (aminomancer)
Owner(s) Emeritus	Ed Lee
Peer(s) Emeritus	Kate Hudson, Matthew N
Includes	browser/components/asrouter/**/* browser/components/aboutwelcome/**/* browser/components/uitour/**/* toolkit/components/messaging-system/**/*
Bugzilla Components	Firefox::Messaging System, Firefox::Tours

Launcher Process

Windows process for bootstrapping the browser process.

Owner(s)	Ray Kraesig (rkraesig)
Peer(s)	Molly Howell (molly) Greg Stoll (gstoll) David Parks (handyman)
Owner(s) Emeritus	Aaron Klotz, Toshihito Kikuchi
Includes	browser/app/winlauncher/**/*
Bugzilla Components	Firefox::Launcher Process

Localization

Tooling to enable translation and facilitate localization.

Owner(s)	Francesco Lodolo (flod)
Peer(s)	Matjaz Horvat (mathjazz) Eemeli Aro (eemeli)
Includes	browser/**/* toolkit/**/*

New Tab Page

The new tab/home page.

Owner(s)	Scott (thecount)
Peer(s)	Amy Churchwell (amy)
Owner(s) Emeritus	Ed Lee
Peer(s) Emeritus	Kate Hudson, Andrei Oprea
Includes	browser/components/newtab/**/*
Bugzilla Components	Firefox::New Tab Page

Password Manager

Managing, saving and filling logins.

Owner(s)	Dimi Lee (dlee)
Peer(s)	Neil Deakin (enndeakin) Issam Mani (issammani) Johannes Schmidt (johannes) Micah Tigley (micah)
Owner(s) Emeritus	Matthew Noorenberghe, Sergey Galich
Peer(s) Emeritus	Bianca Danforth, Severin Rudie, Jared Wein, Tim Giles, Sam Foster
Includes	toolkit/components/passwordmgr/**/* browser/components/aboutlogins/**/*
URL	https://wiki.mozilla.org/Toolkit:Password_Manager
Bugzilla Components	Toolkit::Password Manager, Toolkit::Password Manager: Site, Compatibility, Firefox::about:logins

Picture-in-Picture

A component that allows video elements to be pulled out into an always-on-top window.

Owner(s)	Mike Conley (mconley)
Peer(s)	Niklas Baumgardner (niklas) kpatenio (kpatenio)
Owner(s) Emeritus	Micah Tigley, Molly Howell
Includes	toolkit/components/pictureinpicture browser/extensions/pictureinpicture

Profile Migration

Migrating data from other browsers.

Owner(s)	Gijs
Peer(s)	Mike Conley (mconley) Marco Bonardo (mak) Matthew N (MattN)
Includes	browser/components/migration/**/*

Screenshots

Code relating to Screenshots functionality

Owner(s)	Sam Foster (sfoster) Niklas Baumgardner (niklas)
Peer(s)	Jared Hirsch (jhirsch)
Owner(s) Emeritus	Emma Malysz, Ian Bicking
Peer(s) Emeritus	Barry Chen
Includes	browser/extensions/screenshots/**/* browser/components/screenshots/**/*
Bugzilla Components	Firefox::Screenshots

Search

The search service and search bar.

Owner(s)	Mark Banner (standard8)
Peer(s)	Dale Harvey (daleharvey) James Teow (jteow) Mandy Cheang (mcheang) Stephanie Cunnane (scunnane)
Peer(s) Emeritus	Michael de Boer
Includes	browser/components/search/**/* toolkit/components/search/**/*
Bugzilla Components	Firefox::Search
Review Group	#search-reviewers

Security and Privacy UI

The front-end to our security and privacy features, including Protections UI, Site Identity, Site Permissions and Certificate Errors

Owner(s)	Paul Zühlcke (pbz)
Owner(s) Emeritus	Johann Hofmann
Peer(s) Emeritus	Erica Wright, Nihanth Subramanya, prathiksha
Includes	browser/components/protections/**/* browser/components/controlcenter/**/*
Bugzilla Components	Firefox::Security, Firefox::Protections UI, Firefox::Site Identity, Firefox::Site Permissions

Session Restore

Restoring a user’s session after starting Firefox.

Owner(s)	Sarah Clements (sclements) Sam Foster (sfoster) Andreas Farre (farre)
Peer(s)	Dão Gottwald (dao)
Owner(s) Emeritus	Michael de Boer, Kashav Madan, Dale Harvey, Dão Gottwald
Peer(s) Emeritus	Anny Gakhokidze
Includes	browser/components/sessionstore/**/* toolkit/components/sessionstore/**/*
Bugzilla Components	Firefox::Session Restore

Settings UI

The front-end settings user interface.

Owner(s)	Dave Townsend (mossop)
Peer(s)	Mark Striemer (mstriemer) Gijs Mike Conley (mconley)
Owner(s) Emeritus	Jared Wein
Peer(s) Emeritus	Tim Nguyen
Includes	browser/components/preferences/**/* browser/themes/*/preferences toolkit/mozapps/preferences

Tabbed Browser

The UI component controlling browser tabs.

Owner(s)	Dão Gottwald (dao)
Peer(s)	Marco Bonardo (mak) Mike Conley (mconley) DJ (dwalker) Niklas Baumgardner (niklas) Jeremy Swinarton (jswinarton) Stephen Thompson (sthompson)
Peer(s) Emeritus	Jared Wein, Matthew N
Includes	browser/components/tabbrowser/**/* browser/themes/shared/tabbrowser/*
Bugzilla Components	Firefox::Tabbed Browser

Windows Installer

The installer for Windows.

Owner(s)	Molly Howell (molly)
Peer(s)	Adam Gashlin (agashlin) Nick Alexander (nalexander)
Includes	browser/installer/**/* toolkit/mozapps/installer/**/*
Bugzilla Components	Firefox::Installer

DevTools

Mozilla Developer Tools

Owner(s)	Jan Honza Odvarko (Honza)
Peer(s)	Alexandre Poirot (ochameau) Julian Descottes (jdescottes) Nicolas Chevobbe (nchevobbe) Hubert Boma Manilla (bomsy) Henrik Skupin (whimboo)
Owner(s) Emeritus	Patrick Brosset, Joe Walker, Dave Camp, Rob Campbell
Peer(s) Emeritus	Mihai Șucan, Heather Arthur, Anton Kovalyov, Brandon Benvie, Eddy Bruel, James Long, Matteo Ferretti, Steve Fink (heapsnapshot code), Jaroslav Šnajdr, Tom Tromey, Paul Rouget, Victor Porof, Lin Clark, Jan Keromnes, Jordan Santell, Soledad Penadés, Mike Ratcliffe, Panagiotis Astithas, Tim Nguyen, Brian Grinstead, J. Ryan Stinnett, Jason Laster, David Walsh, Greg Tatum, Gabriel Luong, Brad Werth, Daisuke Akatsuka, Yulia Startsev, Logan Smyth, Julien Wajsberg, Razvan Caliman, Micah Tigley, Nick Fitzgerald, Jim Blandy, Belén Albeza
Includes	devtools/**/*
URL	http://firefox-dev.tools/
Bugzilla Components	DevTools

Fenix

Android Project to build Firefox for Android

Owner(s)	Jeff Boek (boek) Gabriel Luong (gl)
Peer(s)	Roger Yang (royang) Rahul Sainani (rsainani)
Includes	mobile/android/fenix/**/*

Focus for Android

Android Project to build Focus for Android

Owner(s)	Mihai Adrian Carare (mcarare) Roger Yang (royang)
Peer(s)	Iorga Gabriel (giorga)
Includes	mobile/android/focus-android/**/*

JavaScript usage, tools, and style

Aspects of JavaScript use such as language feature usage, tooling such as lint configurations, formatting and naming style.

Owner(s)	Dave Townsend (mossop)
Peer(s)	Gijs Mark Banner (standard8) Jan de Mooij (jandem)
Includes	.eslintrc-test-paths.js **/.eslintrc*.js tools/lint/eslint/**/* .prettier* .stylelint*
Review Group	#frontend-codestyle-reviewers

mots config

Owner(s)	Zeid Zabaneh (zeid)
Includes	mots.yaml

mozharness

Configuration-driven script harness.

Owner(s)	Andrew Halberstadt (ahal)
Peer(s)	Joel Maher (jmaher)
Owner(s) Emeritus	Aki Sasaki, Geoff Brown
Peer(s) Emeritus	Justin Wood, Tom Prince
Includes	testing/mozharness/**/*
Bugzilla Components	Release Engineering :: Applications: MozharnessCore

Python usage, tools, and style

Aspects of Python use such as tooling, formatting and naming style

Owner(s)	Andrew Halberstadt (ahal)
Peer(s)	Mike Hommey (glandium) Marco Castelluccio (marco) Sylvestre Ledru (Sylvestre)
Includes	tools/lint/python/**/*
Bugzilla Components	Developer Infrastructure :: Lint and Formatting

Remote Protocol

Low-level remote protocol exposing interfaces for inspecting state and controlling execution of web documents, instrumenting various subsystems in the browser, simulating user interaction for automation purposes, and for subscribing to updates from the aforementioned.

Owner(s)	Henrik Skupin (whimboo)
Peer(s)	Julian Descottes (jdescottes) James Graham (jgraham) Alexandra Borovova (Sasha)
Includes	remote/**/*
URL	https://firefox-source-docs.mozilla.org/remote/
Bugzilla Components	Remote Protocol

Agent

Underlying transport layer and server to allow remoting of Firefox for automation and debugging.

Owner(s)	Henrik Skupin (whimboo)
Peer(s)	Julian Descottes (jdescottes) James Graham (jgraham) Alexandra Borovova (Sasha)
Owner(s) Emeritus	Andreas Tolfsen
Peer(s) Emeritus	Maja Frydrychowicz, Alexandre Poirot, Yulia Startsev
Includes	remote/**/*
Excludes	remote/cdp/* remote/marionette/* remote/webdriver-bidi/*
Bugzilla Components	Remote Protocol :: Agent

CDP

The core implementation for CDP support. Please file domain specific issues and requests under the appropriate CDP-prefixed Remote Protocol component.

Owner(s)	Henrik Skupin (whimboo)
Peer(s)	Julian Descottes (jdescottes) James Graham (jgraham) Alexandra Borovova (Sasha)
Owner(s) Emeritus	Andreas Tolfsen
Peer(s) Emeritus	Maja Frydrychowicz, Alexandre Poirot, Yulia Startsev
Includes	remote/cdp/*
Bugzilla Components	Remote Protocol :: CDP

Marionette

Marionette is a remote protocol that lets out-of-process programs communicate with, instrument, and control Gecko-based browsers. Combined with geckodriver, this forms our WebDriver classic implementation.

Owner(s)	Henrik Skupin (whimboo)
Peer(s)	Julian Descottes (jdescottes) James Graham (jgraham) Alexandra Borovova (Sasha)
Owner(s) Emeritus	Andreas Tolfsen
Peer(s) Emeritus	Maja Frydrychowicz, David Burns
Includes	remote/marionette/*
Group	dev-webdriver
Bugzilla Components	Remote Protocol :: Marionette

WebDriver BiDi

W3C WebDriver BiDi implementation for Gecko-based browsers.

Owner(s)	Henrik Skupin (whimboo)
Peer(s)	Julian Descottes (jdescottes) James Graham (jgraham) Alexandra Borovova (Sasha)
Includes	remote/webdriver-bidi/*
Group	dev-webdriver
Bugzilla Components	Remote Protocol :: WebDriver BiDi

Sync

Firefox Sync client

Owner(s)	Mark Hammond (markh)
Peer(s)	Lougenia Bailey (lougenia) Tarik Eshaq (teshaq) Ben Dean-Kawamura (bdk) Sammy Khamis (skhamis) Lina Butler (lina)
Owner(s) Emeritus	Ryan Kelly
Includes	services/sync/**/*
URL	https://wiki.mozilla.org/Services/Process/Code_Review
Bugzilla Components	Sync

firefox-ui

Firefox UI test framework.

Owner(s)	Henrik Skupin (whimboo)
Peer(s)	Julian Descottes (jdescottes) James Graham (jgraham) Alexandra Borovova (Sasha)
Peer(s) Emeritus	Maja Frydrychowicz
Includes	testing/firefox-ui/**/*
Bugzilla Components	Testing :: Firefox UI

geckodriver

Proxy for using W3C WebDriver-compatible clients to interact with Gecko-based browsers.

Owner(s)	James Graham (jgraham)
Peer(s)	Henrik Skupin (whimboo)
Includes	testing/geckodriver/**/*
Group	dev-webdriver
Bugzilla Components	Testing :: geckodriver

gtest

GTest test harness.

Owner(s)	Joel Maher (jmaher)
Includes	testing/gtest/**/*
Bugzilla Components	Testing :: GTest

Marionette Client & Harness

Python client and harness for the Marionette remote protocol implementation.

Owner(s)	Henrik Skupin (whimboo)
Peer(s)	Julian Descottes (jdescottes) James Graham (jgraham) Alexandra Borovova (Sasha)
Owner(s) Emeritus	Andreas Tolfsen
Peer(s) Emeritus	Maja Frydrychowicz, David Burns
Includes	testing/marionette/**/*
Bugzilla Components	Testing :: Marionette Client & Harness

Mochitest

Mochitest test framework

Owner(s)	Andrew Halberstadt (ahal)
Peer(s)	Joel Maher (jmaher)
Includes	testing/mochitest/**/*
Bugzilla Components	Testing :: Mochitest

Mozbase

Base modules used for implementing test components.

Owner(s)	Joel Maher (jmaher)
Peer(s)	Andrew Halberstadt (ahal) Andreas Tolfsen (ato) Bob Clary (bc) James Graham (jgraham) Henrik Skupin (whimboo)
Includes	testing/mozbase
Bugzilla Components	Testing :: Mozbase, Testing :: Mozbase Rust

Performance Testing

This module encompasses all of our performance testing projects, e.g. Raptor, Talos, MozPerfTest, AWSY, JSShell, mach try perf, etc.. See our PerfDocs for more information on the owners/peers of the various components (linked below).

Owner(s)	Greg Mierzwinski (sparky)
Peer(s)	Andrej (aglavic) Dave Hunt (davehunt) Kash Shampur (kshampur)
Includes	testing/raptor/**/* testing/talos/**/* python/mozperftest/**/* testing/awsy/**/* testing/jsshell/**/* tools/lint/perfdocs/**/* testing/perfdocs/**/* testing/performance/**/* testing/condprofile/**/* tools/browsertime/**/* tools/tryselect/selectors/perf.py
URL	Performance Testing
Bugzilla Components	Testing :: Raptor, Testing :: Talos, Testing :: AWSY, Testing :: Performance, Testing :: mozperftest, Testing :: Condprofile

Reftest (+ jsreftest + crashtest)

Reftest test framework

Owner(s)	Timothy Nikkel (tnikkel)
Peer(s)	Andrew Halberstadt (ahal) Joel Maher (jmaher)
Includes	layout/tools/reftest/**/*
Bugzilla Components	Testing :: Reftest

Tryselect

Frontend for selecting jobs on the try server.

Owner(s)	Andrew Halberstadt (ahal)
Peer(s)	James Graham (jgraham) Marco Castelluccio (marco)
Includes	tools/tryselect/**/*
Bugzilla Components	Developer Infrastructure :: Try

web-platform-tests infrastructure

Infrastructure for running the cross-browser web-platform-tests

Owner(s)	James Graham (jgraham)
Includes	testing/web-platform/**/* testing/web-platform/tests/tools/**/*
Excludes	testing/web-platform/tests/**/* testing/web-platform/meta/**/* testing/web-platform/mozilla/**/*
Bugzilla Components	Testing :: web-platform-tests

XPCShell

XPCShell test harness.

Owner(s)	Joel Maher (jmaher)
Includes	testing/xpcshell/**/*
Bugzilla Components	Testing::XPCShell Harness

Toolkit

Components shared between desktop and mobile browsers.

Owner(s)	Dave Townsend (mossop) Gijs
Peer(s)	Dão Gottwald (dao) Marco Bonardo (mak) Mike Conley (mconley) Molly Howell (molly)
Peer(s) Emeritus	Matthew Noorenberghe, Jared Wein
Includes	toolkit/**/*
Group	firefox-dev
Bugzilla Components	Firefox, Toolkit

Application Startup

The profile system and startup process before the front-end launches.

Owner(s)	Dave Townsend (mossop)
Peer(s) Emeritus	Nathan Froyd
Includes	toolkit/profile/**/* toolkit/components/remote/**/* toolkit/xre/**/*

Telemetry

The core infrastructure in the Firefox client to send back telemetry data. Includes the common mechanisms to record, view and submit data: Legacy Telemetry and Glean (via Firefox on Glean (FOG)). This module does ‘’not’’ include responsibility for every piece of submitted Telemetry data. Each team/module is responsible for their own measurements (histograms, scalars, other ping submissions, etc.).

Owner(s)	Chris H-C (chutten)
Peer(s)	Alessio Placitelli (Dexter) Jan-Erik Rediger (janerik) Travis Long (travis_)
Owner(s) Emeritus	Georg Fritzsche
Peer(s) Emeritus	Perry McManis
Includes	toolkit/components/glean/**/* toolkit/components/telemetry/**/* toolkit/content/aboutTelemetry.*
Group	fx-data-dev
URL	Telemetry

UI Widgets

The base widgets used throughout the UI.

Owner(s)	Mark Striemer (mstriemer)
Peer(s)	Marco Bonardo (mak) Tim Giles (tgiles) Hanna Jones (hjones)
Owner(s) Emeritus	Neil Deakin
Peer(s) Emeritus	Andrew Swan
Includes	toolkit/content/widgets/**/*

WebCompat Addons

Compatibility interventions (webcompat system addon) and bug reporting capabilities (Report Site Issue addon).

Owner(s)	Dennis Schubert (denschub) Thomas Wisniewski (twisniewski)
Peer(s)	Ksenia Berezina (ksy36)
Peer(s) Emeritus	Mike Taylor
Includes	browser/extensions/report-site-issue browser/extensions/webcompat mobile/android/android-components/components/feature/webcompat mobile/android/android-components/components/feature/webcompat-reporter toolkit/components/reportbrokensite https://github.com/mozilla-extensions/webcompat-addon
Group	compatibility
URL	https://wiki.mozilla.org/Compatibility/System_Addon
Bugzilla Components	Web Compatibility::Interventions, Web Compatibility::Tooling & Investigations

Webextensions

Webextension APIs and integration.

Owner(s)	scaraveo Tomislav Jovanovic (zombie)
Peer(s)	Luca Greco (rpl) Rob Wu (robwu) William Durand (willdurand)
Peer(s) Emeritus	Andrew Swan, Kris Maglione
Includes	browser/components/extensions/**/* toolkit/components/extensions/**/*

Translation

Support for translation in Firefox, and the infrastructure to train new translation language models.

Owner(s)	Greg Tatum (gregtatum)
Peer(s)	Erik Nordin (nordzilla) Evgeny Pavlov (epavlov) Marco Castelluccio (marco)
Includes	toolkit/components/translations/**/* toolkit/components/translation/**/* browser/components/translations/**/*
Group	dev-platform
URL	https://github.com/mozilla/firefox-translations-training https://github.com/mozilla/firefox-translations-models https://github.com/mozilla/firefox-translations-evaluations https://github.com/mozilla/firefox-translations
Bugzilla Components	Firefox::Translation
Review Group	#translations-reviewers

Tree Sheriffs

Tree Sheriffs aid developers to easily, quickly, and seamlessly land their code in the proper location(s) and ensure that code does not break our automated tests. In the service of this objective, the Sheriffs work closely with the larger engineering organization to create and enforce landing policies that increase productivity while maintaining an efficient and robust automated testing system. Beyond the policy role, they have also become shepherds of automation quality by monitoring intermittent failures, performing uplifts and merges, and identifying poorly performing automation machines.

Owner(s)	Sebastian Hengst (aryx)
Peer(s)	Ryan VanderMeulen (ryanvm)
Peer(s) Emeritus	Carsten Book, Wes Kocher
Group	sheriffs
URL	https://wiki.mozilla.org/Sheriffing

URL Classifier

Database and list-based classification of URL resources, such as Tracking Protection and SafeBrowsing.

Owner(s)	Dimi Lee (dlee) Luke Crouch (groovecoder)
Peer(s)	Tim Huang (timhuang) Gian-Carlo Pascutto (gcp)
Owner(s) Emeritus	François Marier
Peer(s) Emeritus	Henry Chang, Ryan Tilder
Includes	toolkit/components/url-classifier/**/* netwerk/url-classifier/**/*
Group	dev-platform
URL	https://github.com/mozilla-services/shavar https://wiki.mozilla.org/Phishing_Protection https://wiki.mozilla.org/Security/Tracking_protection https://wiki.mozilla.org/Security/Application_Reputation