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+Pocket Guide: Shipping Firefox
+==============================
+
+*Estimated read time:* 15min
+
+
+Introduction
+------------
+
+The purpose of this document is to provide a high level understanding of
+how Mozilla ships Firefox. With the intention of helping new Mozillians
+(and those who would like a refresher) understand the basics of our
+release process, tools, common terms, and mechanisms employed in
+shipping Firefox to our users. Often this document will introduce a
+concept, explain how it fits into the process, and then provide a link
+to learn more if interested.
+
+Repositories & Channels
+-----------------------
+
+Shipping Firefox follows a software release :ref:`train model <train model>`
+along 3 primary code :ref:`repositories <repositories>`; mozilla-central
+(aka “m-c”), mozilla-beta, and mozilla-release. Each of these repositories are
+updated within a defined cadence and built into one of our Firefox
+products which are released through what is commonly referred to as
+:ref:`Channels <channels>`: Firefox Nightly, Firefox Beta, and Firefox Release.
+
+`Firefox Nightly <https://whattrainisitnow.com/release/?version=nightly>`__ offers access to the latest cutting edge features
+still under active development. Released every 12 hours with all the
+changes that have :ref:`landed <landing>` on mozilla-central for Desktop and on
+`main in firefox-android <https://github.com/mozilla-mobile/firefox-android/tree/main>`__ for Android.
+
+Every `4 weeks <https://whattrainisitnow.com/calendar/>`__, we
+:ref:`merge <merge>` the code from mozilla-central to our
+mozilla-beta branch.
+For Android, we branch from main on firefox-android to a release branch.
+New code or features can be added to mozilla-beta
+outside of this 4 week cadence but will be required to land in
+mozilla-central and then be :ref:`uplifted <uplift>` into
+mozilla-beta.
+Similarly for Android, uplifts are required to land in main on firefox-android before
+backporting to the firefox-android release branch.
+
+`Firefox Beta <https://whattrainisitnow.com/release/?version=beta>`__ is for developers and early adopters who want to see
+and test what’s coming next in Firefox. We release a new Desktop/Android Beta version
+three times a week.
+
+.. note::
+
+  The first and second beta builds of a new cycle are shipped to a
+  subset of our Beta population. The full Beta population gets updated
+  starting with Beta 3 only.*
+
+Each Beta cycle lasts a total of 4 weeks where a final build is
+validated by our QA and tagged for release into the mozilla-release
+branch for Desktop. On Android we release from the same release branch
+used during the Beta cycle.
+
+.. note::
+
+  **Firefox Developer Edition** *is a separate product based on
+  the mozilla-beta repo and is specifically tailored for Web Developers.*
+
+`Firefox Release <https://whattrainisitnow.com/release/?version=release>`__ is released every 4 weeks and is the end result
+of our Beta cycle. This is our primary product shipping to hundreds of
+millions of users. While a release is live, interim updates (dot releases)
+are used to ship important bug fixes to users prior to the next major release.
+These can happen on an as-needed basis when there is an important-enough
+:ref:`driver <dot release drivers>` to do so (such as a critical bug severely
+impairing the usability of the product for some users). In order to provide
+better predictability, there is also a planned dot release scheduled for two
+weeks after the initial go-live for less-critical fixes and other
+:ref:`ride-along fixes <ride alongs>` deemed low-risk enough to include.
+
+.. note::
+  `Firefox ESR (Extended Support Release) <https://whattrainisitnow.com/release/?version=esr>`__ *is a separate
+  product intended for Enterprise use. Major updates are rolled out once
+  per year to maintain stability and predictability. ESR also
+  contains a number of policy options not available in the standard
+  Firefox Release. Minor updates are shipped in sync with the Firefox
+  Release schedule for security and select quality fixes only.*
+
+Further Reading/Useful links:
+
+-  `Firefox
+   Trains <https://whattrainisitnow.com/>`__
+-  `Release
+   Calendar <https://whattrainisitnow.com/calendar/>`__
+-  `Firefox Release
+   Process <https://wiki.mozilla.org/Release_Management/Release_Process>`__
+-  `Firefox Delivery
+   dashboard <https://mozilla.github.io/delivery-dashboard/>`__
+
+Landing Code and Shipping Features
+----------------------------------
+
+Mozillians (those employed by MoCo and the broader community) land lots
+of code in the Mozilla repositories: fixes, enhancements, compatibility,
+new features, etc. and is managed by :ref:`Mercurial <Mercurial Overview>` (aka
+hg). All new code is tracked in :ref:`Bugzilla <bugzilla>`, reviewed
+in :ref:`Phabricator <Phabricator>`, and then checked into the
+mozilla-central repository using :ref:`Lando <Lando>`.
+
+.. note::
+
+  Some teams use :ref:`GitHub <github>` during development
+  but will still be required to use Phabricator (tracked in Bugzilla) to
+  check their code into the mozilla-central hg repository.
+
+The standard process for code to be delivered to our users is by ‘riding
+the trains’, meaning that it’s landed in mozilla-central where it waits
+for the next Beta cycle to begin. After merging to Beta the code will
+stabilize over a 4 week period (along with everything else that merged
+from mozilla-central). At the end of the beta cycle a release candidate
+(:ref:`RC <rc>`) build will be generated, tested thoroughly, and
+eventually become the next version of Firefox.
+
+Further Reading/Useful links:
+
+-  `Phabricator and why we use it <https://wiki.mozilla.org/Phabricator>`__
+-  `Firefox Release Notes Process <https://wiki.mozilla.org/Release_Management/Release_Notes>`__
+-  `Firefox Release Notes Nomination <https://wiki.mozilla.org/Release_Management/Release_Notes_Nomination>`__
+
+An exception to this process...
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Not all code can simply wait for the normal train model to be included
+in a Firefox build. There are a variety of reasons for this; critical
+fixes, security concerns, stabilizing a feature that’s already in Beta,
+shipping high priority features faster, and so on.
+
+In these situations an uplift can be requested to take a recent landing
+in mozilla-central and merge specific bits to another repository outside
+the standard train model. After the request is made within Bugzilla,
+:ref:`Release Management <release management>` will assess the potential risk
+and will make a decision on whether it’s accepted.
+
+Further Reading/Useful links:
+
+-  `Patch uplifting
+   rules <https://wiki.mozilla.org/Release_Management/Uplift_rules>`__
+-  `Requesting an
+   uplift <https://wiki.mozilla.org/Release_Management/Requesting_an_Uplift>`__
+
+Ensuring build stability
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Throughout the process of landing code in mozilla-central to riding the
+trains to Firefox Release, there are many milestones and quality
+checkpoints from a variety of teams. This process is designed to ensure
+a quality and compelling product will be consistently delivered to our
+users with each new version. See below for a distilled list of those
+milestones.
+
+=========================================== ================ ================= ===============================================================================
+Milestone                                   Week             Day of Week
+------------------------------------------- ---------------- ----------------- -------------------------------------------------------------------------------
+Merge Day                                   Nightly W1       Monday            Day 1 of the new Nightly Cycle
+PI Request deadline                         Nightly W1       Friday            Manual QA request deadline for high risk features
+Feature technical documentation due         Nightly W2       Friday            Deadline for features requiring manual QA
+Beta release notes draft                    Nightly W4       Wednesday
+Nightly features Go/No-Go decisions         Nightly W4       Wednesday
+Feature Complete Milestone                  Nightly W4       Wednesday         Last day to land risky patches and/or enable new features
+Nightly soft code freeze start              Nightly W4       Thursday          Stabilization period in preparation to merge to Beta
+String freeze                               Nightly W4       Thursday          Modification or deletion of strings exposed to the end-users is not allowed
+QA pre-merge regression testing completed   Nightly W4       Friday
+Merge Day                                   Beta W1          Monday            Day 1 of the new Beta cycle
+Pre-release sign off                        Beta W3          Friday            Final round of QA testing prior to Release
+Firefox RC week                             Beta W4          Monday            Validating Release Candidate builds in preparation for the next Firefox Release
+Release Notes ready                         Beta W4          Tuesday
+What’s new page ready                       Beta W4          Wednesday
+Firefox go-live @ 6am PT                    Release W1       Tuesday           Day 1 of the new Firefox Release to 25% of Release users
+Firefox Release bump to 100%                Release W1       Thursday          Increase deployment of new Firefox Release to 100% of Release users
+Scheduled dot release approval requests due Release W2       Friday            All requests required by EOD
+Scheduled dot release go-live               Release W3       Tuesday           By default, ships when ready. Specific time available upon request.
+=========================================== ================ ================= ===============================================================================
+
+
+The Release Management team (aka “Relman”) monitors and enforces this
+process to protect the stability of Firefox. Each member of Relman
+rotates through end-to-end ownership of a given :ref:`release
+cycle <release cycle>`. The Relman owner of a cycle will focus on the
+overall release, blocker bugs, risks, backout rates, stability/crash
+reports, etc. Go here for a complete overview of the `Relman Release
+Process
+Checklist <https://wiki.mozilla.org/Release_Management/Release_Process_Checklist_Documentation>`__.
+
+.. note::
+
+  While Relman will continually monitor the overall health of each
+  Release it is the responsibility of the engineering organization to
+  ensure the code they are landing is of high quality and the potential
+  risks are understood. Every Release has an assigned :ref:`Regression
+  Engineering Owner <reo>` (REO) to ensure a decision is made
+  about each regression reported in the release.*
+
+Further Reading/Useful links:
+
+-  `Release Tracking
+   Rules <https://wiki.mozilla.org/Release_Management/Tracking_rules>`__
+-  `Release
+   Owners <https://wiki.mozilla.org/Release_Management/Release_owners>`__
+-  `Regression Engineering
+   Owners <https://wiki.mozilla.org/Platform#Regression_Engineering_Owner_.28REO.29>`__
+-  `Commonly used Bugzilla queries for all
+   Channels <https://trainqueries.herokuapp.com/>`__
+
+Enabling/Disabling code (Prefs)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Within Firefox we allow the ability to Enable/Disable bits of code or
+entire features using `Preferences <preferences>`. There are many
+reasons why this is useful. Here are some examples:
+
+-  Continual development over multiple release cycles without exposing
+   partially completed features to our users
+-  Provide the ability to quickly disable a feature if there is a
+   problem found during the release process
+-  Control features which are experimental or not ready to be shown to a
+   specific channel population (e.g. enabled for Beta but disabled for
+   Release)
+-  A/B testing via :ref:`telemetry <telemetry>` experiments
+
+.. note::
+
+  :ref:`Normandy <normandy>` Pref Rollout is a feature that
+  allows Mozilla to change the state of a preference for a targeted set of
+  users, without deploying an update to Firefox. This is especially useful
+  when conducting experiments or a gradual rollout of high risk features
+  to our Release population.
+
+Further Reading/Useful links:
+
+-  `Brief guide to Mozilla
+   preferences <https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/A_brief_guide_to_Mozilla_preferences>`__
+-  `Normandy Pref
+   rollout <https://wiki.mozilla.org/Firefox/Normandy/PreferenceRollout>`__
+
+Release & Feature QA
+~~~~~~~~~~~~~~~~~~~~
+
+Release QA is performed regularly and throughout the Release Cycle.
+Organized in two-week sprints its primary goals are:
+
+-  Qualifying builds for release
+-  Feature testing
+-  Product Integrity requests
+-  Bug work
+-  Community engagement
+
+Features that can have significant impact and/or pose risk to the code
+base should be nominated for QA support by the :ref:`feature
+owner <feature owner>` in its intended release. This process is kicked
+off by filing a :ref:`Product Integrity <product integrity>` team request
+:ref:`PI request <pi request>`. These are due by the end of week 2
+of the Nightly cycle.
+
+.. note::
+
+  Manual QA testing is only required for features as they go
+  through the Beta cycle. Nightly Feature testing is always optional.
+
+Further Reading/Useful links:
+
+-  `QA Feature
+   Testing <https://wiki.mozilla.org/QA/Feature_Testing_v2>`__
+-  `Release QA
+   overview <https://docs.google.com/document/d/1ic_3TO9-kNmZr11h1ZpyQbSlgiXzVewr3kSAP5ML4mQ/edit#heading=h.pvvuwlkkvtc4>`__
+-  `PI Request template and
+   overview <https://mana.mozilla.org/wiki/pages/viewpage.action?spaceKey=PI&title=PI+Request>`__
+
+Experiments
+~~~~~~~~~~~
+
+As we deliver new features to our users we continually ask ourselves
+about the potential impacts, both positive and negative. In many new
+features we will run an experiment to gather data around these impacts.
+A simple definition of an experiment is a way to measure how a change to
+our product affects how people use it.
+
+An experiment has three parts:
+
+1. A new feature that can be selectively enabled
+2. A group of users to test the new feature
+3. Telemetry to measure how people interact with the new feature
+
+Experiments are managed by an in-house tool called
+`Experimenter <https://experimenter.services.mozilla.com/>`__.
+
+Further Reading/Useful links:
+
+-  `More about experiments and
+   Experimenter <https://github.com/mozilla/experimenter>`__
+-  `Requesting a new
+   Experiment <https://experimenter.services.mozilla.com/experiments/new/>`__
+   (Follow the ‘help’ links to learn more)
+-  `Telemetry <https://wiki.mozilla.org/Telemetry>`__
+
+Definitions
+-----------
+
+.. _approval flag:
+
+**Approval Flag** - A flag that represents a security approval or uplift
+request on a patch.
+
+.. _bugzilla:
+
+**Bugzilla** - Web-based general purpose bug tracking system and testing
+tool.
+
+.. _channel:
+
+**Channel** - Development channels producing concurrent releases of
+Firefox for Windows, Mac, Linux, and Android.
+
+.. _chemspill:
+
+**Chemspill** - Short for Chemical Spill. A chemspill is a rapid
+security-driven or critical stsbility dot release of our product.
+
+.. _channel meeting:
+
+**Channel Meeting** - A twice weekly time to check in on the status
+of the active releases with the release team.
+
+.. _dot release drivers:
+
+**Dot Release Drivers** - Issues/Fixes that are significant enough to
+warrant a minor dot release to the Firefox Release Channel. Usually to
+fix a stability (top-crash) or Security (Chemspill) issue.
+
+.. _early beta:
+
+**Early Beta** - Beta releases with the features gated by EARLY_BETA_OR_EARLIER
+enabled. The first 2 weeks of Beta releases during the cycle are early beta releases.
+
+.. _feature owner:
+
+**Feature Owner** - The person who is ultimately responsible for
+developing a high quality feature. This is typically an Engineering
+Manager or Product Manager.
+
+.. _fenix:
+
+**Fenix** - Also known as Firefox Preview is an all-new browser for
+Android based on GeckoView and Android Components
+
+.. _github:
+
+**Github** - Web-based version control and collaboration platform for
+software developers
+
+.. _gtb:
+
+**GTB** - Acronym for Go to build.  Mostly used in the release schedule
+communication ("Go to build on March 18"), this means that we initiate the
+building of a specific release.
+
+.. _landing:
+
+**Landing** - A general term used for when code is merged into a
+particular source code repository
+
+.. _lando:
+
+**Lando** - Automated code lander for Mozilla. It is integrated with
+our `Phabricator instance <https://phabricator.services.mozilla.com>`__
+and can be used to land revisions to various repositories.
+
+.. _mercurial:
+
+**Mercurial** - A source-code management tool (just like git)
+which allows users to keep track of changes to the source code
+locally and share their changes with others. It is also called hg.
+
+.. _merge:
+
+**Merge** - General term used to describe the process of integrating and
+reconciling file changes within the mozilla repositories
+
+.. _nightly soft code freeze:
+
+**Nightly Soft Code Freeze** - Last week of the nightly cycle on mozilla-central
+just before the merge to beta during which landing risky or experimental code
+in the repository is discouraged.
+
+.. _normandy:
+
+**Normandy** - Normandy is a collection of servers, workflows, and
+Firefox components that enables Mozilla to remotely control Firefox
+clients in the wild based on precise criteria
+
+.. _nucleus:
+
+**Nucleus** - Name of the internal application used by release managers
+to prepare and publish release notes. The data in this application is
+fetched by mozilla.org.
+
+.. _orange_factor:
+
+**Orange** - Also called flaky or intermittent tests. Describes a state
+when a test or a testsuite can intermittently fail.
+
+.. _phabricator:
+
+**Phabricator** - Mozilla’s instance of the web-based software
+development collaboration tool suite. Read more about `Phabricator as a
+product <https://phacility.com/phabricator/>`__.
+
+.. _pi request:
+
+**PI Request** - Short for Product Integrity Request is a form
+submission request that’s used to engage the PI team for a variety of
+services. Most commonly used to request Feature QA it can also be used
+for Security, Fuzzing, Performance, and many other services.
+
+.. _preferences:
+
+**Preferences** - A preference is any value or defined behavior that can
+be set (e.g. enabled or disabled). Preference changes via user interface
+usually take effect immediately. The values are saved to the user’s
+Firefox profile on disk (in prefs.js).
+
+.. _rc:
+
+**Release Candidate** - Beta version with potential to be a final
+product, which is ready to release unless significant bugs emerge.
+
+.. _rc week:
+
+**RC Week** - The week prior to release go-live is known as RC week.
+During this week an RC is produced and tested.
+
+.. _release cycle:
+
+**Release Cycle** - The sum of stages of development and maturity for
+the Firefox Release Product.
+
+.. _reo:
+
+**Regression Engineering Owner** - A partner for release management
+assigned to each release. They both keep a mental state of how we are
+doing and ensure a decision is made about each regression reported in
+the release. AKA *REO*.
+
+.. _release engineering:
+
+**Release engineering** - Team primarily responsible for maintaining
+the build pipeline, the signature mechanisms, the update servers, etc. aka *releng*
+
+.. _release management:
+
+**Release Management** - Team primarily responsible for the process of
+managing, planning, scheduling and controlling a software build through
+different stages and environments. aka *relman*.
+
+.. _relnotes:
+
+**Relnotes** - Short for release notes. Firefox Nightly, Beta, and Release each ship
+with release notes.
+
+.. _Repository:
+
+**Repository** - a collection of stored data from existing databases
+merged into one so that it may be shared, analyzed or updated throughout
+an organization.
+
+.. _ride alongs:
+
+**Ride Alongs** - Bug fixes that are impacting release users but not
+considered severe enough to ship without an identified dot release
+driver.
+
+.. _rollout:
+
+**Rollout** - Shipping a release to a percentage of the release population.
+
+.. _status flags:
+
+**Status Flags** - A flag that represents the status of the bug with
+respect to a Firefox release.
+
+.. _string freeze:
+
+**String Freeze** - Period during which the introduction, modification, or
+deletion of strings exposed to the end-users is not allowed so as to allow our
+localizers to translate our product.
+
+.. _taskcluster:
+
+**taskcluster** - Our execution framework to build, run tests on multiple
+operating system, hardware and cloud providers.
+
+.. _telemetry:
+
+**Telemetry** - Firefox measures and collects non-personal information,
+such as performance, hardware, usage and customizations. This
+information is used by Mozilla to improve Firefox.
+
+.. _train model:
+
+**Train model** - a form of software release schedule in which a number
+of distinct series of versioned software releases are released as a
+number of different "trains" on a regular schedule.
+
+.. _tracking flags:
+
+**Tracking Flags** - A Bugzilla flag that shows whether a bug is being investigated
+for possible resolution in a Firefox release. Bugs marked tracking-Firefox XX are
+bugs that must be resolved one way or another before a particular release ship.
+
+.. _throttle unthrottle:
+
+**Throttle/Unthrottle a rollout** - Throttle is restricting a release rollout to 0%
+of the release population, users can still choose to update but are not updated
+automatically. Unthrottle is removing the release rollout restriction.
+
+.. _uplift:
+
+**Uplift** - the action of taking parts from a newer version of a
+software system (mozilla-central or mozilla-beta) and porting them to an
+older version of the same software (mozilla-beta, mozilla-release or ESR)