Release Management/Release Process Checklist Documentation

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The goal of this page is to document the Release Process Checklist being used by Firefox Release Managers to track each release throughout the cycle. Any changes to this documentation or the checklist should be reflected in both documents.

Nightly Checklist

Given the nature of how nightly builds are created and shipped, the role of the release manager during this phase of the cycle skews much more heavily to the monitoring aspect rather than release mechanics.

Prior to the start of the cycle, the follow tasks need to be performed:

  • Update the milestones tab on release tracking spreadsheet. Check milestones tab of release template for how to. This will ideally be ready at least two weeks prior to the start of the cycle, with feedback received from key stakeholders (QA, RelEng, RelMan) prior to wider publishing.
  • Verify that the release calendar is up to date. This can be done in conjunction with the milestones document or after it’s published.
  • Ensure that the release has a Regression Engineering Owner identified. Ultimately, ownership of this task falls within the Firefox engineering org. However, it is good for the release manager to ensure that this doesn’t get stalled.
  • On Merge Day: Add tracking and status flags for the new Nightly version. Example bug:

On a daily (or thereabouts) basis, the following items should be monitored:

  • Pending tracking-firefoxXX requests. These are bugs which have been nominated for extra tracking during the cycle. A decision needs to be made about whether the bug indeed warrants that additional attention, and possibly even blocker status. At the beginning of the cycle, bug queries will need to be created for this purpose. Once that query exists, the item in Column A can be updated to a link. (TODO: document tracking decision making process)
  • Open tracking-firefoxXX+ and blocking bugs. The main purpose of this step is to ensure that bugs falling into these categories don’t stagnate. Where possible, release managers should ensure that the bug is in the right component, has an appropriate assignee (for either investigating or fixing, depending on the stage of the bug), and is in general making progress (and poking if it doesn’t appear to be). In the case of blocker bugs, expediting a fix or backout may become necessary. At the beginning of the cycle, bug queries will need to be created for this purpose. Once that query exists, the item in Column A can be updated to a link.
  • Newly-filed regression bugs. This can be done in conjunction with the Regression Engineering Owner of the release. Bug queries should be available from the Platform wiki page. New regressions are generally the most important to track on a regular basis, but the carry-over regression lists can also surface bugs which have fallen off the radar which may require reprioritization.
  • Review stability rates and reported crash spikes. This can be spikes detected by automation, which sends email which is usually monitored by the stability team. Release managers may also want to pay attention to these spikes and help file bugs. Also keep an eye on stability through monitoring the Mission Control rate and top crashes on crash-stats.

On a weekly basis, a review of the Firefox Trello board should be done to monitor the status of features currently targeting that release. This can be done in conjunction with the weekly cross-functional meeting or Feature Status Review in the channel meeting. Release managers are also encouraged to watch the list for their release in order to receive notifications for any changes in status.

RelMan Process Trello.png

The release manager should also review the test plans for features targeting their releases to become familiar with how the feature works and how we intend to ensure it is of sufficient quality to ship in that release. This also gives an opportunity to provide feedback on the risk analysis and mitigations put in place.

Once Nightly test reports are emailed by QA, the release manager should check the newly-reported bugs to make sure flags are set correctly and the new issues have been addressed by engineering and product teams and prioritized accordingly. Release managers can help make sure that all of the pertinent information is in place to make decisions about whether the feature is ready to ship to Beta or whether it should remain Nightly-only for another cycle for more testing and development.

Near the end of the cycle, the following actions must be performed:

  • Send Nightly soft freeze reminder to dev-platform & firefox-dev. This should be done a week before the start of the soft freeze to remind developers that the window for landing riskier fixes is coming to a close until after the version bump.
  • Create the Release Process spreadsheet. This must be done prior to the first merge of mozilla-central to mozilla-beta in time for the b1 build. Duplicate the existing template.
  • Prepare Beta release notes. This must be done before the release goes to the wider Beta audience (after the final merge to Beta and Nightly version bump has happened). (TODO: document the release note creation process)

Beta Checklist

Ongoing Tasks

Once a release moves to the Beta channel, the daily tasks performed during the Nightly cycle will continue to be carried out as new bug reports come in from a wider audience and new features move through the QA cycle towards shipping.

There is also an added triage step during Beta - monitoring the “missed uplifts” email or queries to find issues fixed in Nightly but that still affect Beta. The release owner should check these issues to assess whether uplift is a good idea. If not, then the issue should be marked wontfix for Beta.

Release Tasks

To ship a release, a series of steps must be taken with various roles representing multiple teams expected to contribute. In the Release Process spreadsheet, the Beta Checklist template tab should be duplicated for each new release for proper tracking. After a release is shipped, the tab can be hidden in order to minimize clutter.

  • Review tracking-firefoxXX+ bugs and approval requests. As noted above, regular triage of tracking+ bugs and uplift approval requests must be performed. Approval requests can be viewed via the Release Tracking Report on Bugzilla.
  • Verify all approved bugs landed on mozilla-beta. After approving patches for uplift, they must be pushed to the mozilla-beta repository. This task can be performed by the Tree Sheriffs ( on matrix) or by the release manager themselves depending on their comfort level. The longer-term goal is to automate the process.
  • Set up builds in ship-it (Desktop, DevEdition, Fennec). Ship-it is the tool used for scheduling the release process, starting with the creation of the builds (picking a revision, verifying the version number, etc) and the eventual pushing of those builds to the release mirrors and website. Access to ship-it requires being connected to the Mozilla VPN. When automated beta builds are enabled, this happens for Firefox and DevEdition without human action at 21:00 UTC on Sundays, Tuesdays and Thursdays (source).
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Fenix betas are created as needed by the mobile team.

  • Treeherder tests green/starred. Treeherder is the primary dashboard for monitoring the results of builds and tests. It is the responsibility of the sheriffs to monitor the Beta repository and ensure that tests are passing, though the release manager can also keep an eye on things. Builds should not be started until CI has passed to avoid shipping defective code to end users.
  • Start builds from ship-it. Once CI results are good, the process of generating the builds (go-to-build) is started by clicking the promote button for each release. This is only necessary for manual desktop builds.
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  • Confirm builds have started. Emails will be sent to the release-signoff mailing list once builds have started and a notification will be posted in the matrix channel.
Taskcluster email start.png
  • Confirm notification sent when builds finish. An automated email will be sent to the release-signoff mailing list once the release promotion process is finished. Example: the email has the subject line "firefox 67.0b19 build1/mozilla-beta is in the candidates directory".
  • Schedule push to CDN. After the initial builds are completed, they will be located in the /candidates directory of the main Mozilla FTP server. Prior to widespread shipping, the builds must also be pushed out to CDN mirrors. Because it is difficult and time-consuming to un-ship releases once they have been pushed to CDNs, this step must be performed after it is confirmed that the created builds are satisfactory. For Beta releases, this should wait until after the update-verify tasks have passed to ensure the integrity of the partial updates created during the release promotion process. The CDN push is started from ship-it by clicking the push button for each release. This is typically the final step for the go-to-build day itself. This is only necessary for manual desktop builds.
RelMan Process Ship-It v2 4.png
  • Confirm notification sent when CDN push finishes. An automated email will be sent to the release-signoff mailing list once the push to cdntest has finished successfully. Sample email subject line: "firefox 67.0b19 build1/mozilla-beta has been pushed to cdntest".
  • Push Desktop/DevEdition to Beta. The release is scheduled in ship-it by pushing the ship button for each release. This is only necessary for manual desktop builds.
RelMan Process Ship-It v2 5.png
  • Verify that the Balrog rule changes are live. In order to verify that the rule changes have taken proper effect, check the balrog firefox-beta and devedition rules, or (while connected to the VPN) check the rules on the beta and [1] channels.
RelMan Process Balrog 2.png
  • Email release-signoff with confirmation that updates are live. Be sure to note the rollout % as well.
  • QA manual testing signoff for Desktop/DevEdition. Ask in the #qa-coordination Slack channel if there are questions about progress. A comment is added to trello once this is complete.
  • Update tests on Aurora & Beta. Final verification by QA that updates are working on the live update channels. A comment is added to trello once this is complete.

Summary of email notifications for QA/relman

Here is an example of the subject lines of emails to expect on release-signoff, and what they mean.

  • 1. [desktop] Build of firefox 67.0b16 build 2
Sent when relman (or shipit, for automated beta builds) sets up a new build in ship-it and starts the "build promotion" process. Several hours later (4-7 or so) builds will start to appear in the candidates directory. Be sure to note the build number and test the right builds.
  • 2. firefox 67.0b16 build2/mozilla-beta is in the candidates directory
Sent when all the builds are complete. These builds can be used for manual/functional testing.
  • 3. firefox 67.0b16 build2/mozilla-beta has been pushed to cdntest
When this email is sent, the builds are ready for update testing on the beta-cdntest channel.
  • 4. firefox 67.0b16 build2/mozilla-beta updates are ready for signoff in Balrog!
This is an automated notice, for the release managers, that releng has set up the update rules in Balrog (a control panel for the update server).
  • 5. [desktop] Firefox/DevEdition 67.0b16 is live on the beta/aurora channels at 100%
This is sent manually by release management, to acknowledge that the release is now live. It's now ready for update testing on the beta channel.

RC Uplifts

This tab is for tracking bugs which are being tracked for possible uplift to the mozilla-release repository for RC builds. The primary objectives are:

  • Track whether there are any drivers for a respin of the RC builds during RC week.
  • Assess whether Desktop, Mobile, or both are affected by the issues noted.
  • Verify that all drivers have had an explicit decision made.

RC Checklist

The RC checklist, like the Beta checklist, should be cloned for each RC build created (RC1, RC2, etc). Most of the steps for the RC checklist are the same as the Beta checklist, but with a few notable differences as discussed below.

  • In ship-it, click "release" to set up the build. The release date/ETA should be 6am Pacific (which has to be adjusted to local time in the shipit UI) for the projected release date unless otherwise arranged. Build 1 will be your RC1. If you need an RC2, then cancel build 1 and start RC2.
    • Sample partials (for 66.0 RC): 65.0.2build1,65.0.1build2,65.0build2,64.0.2build1,66.0b14build1. Usually the auto-populated list can be left unmodified.
  • Update test on beta. Relman can click "push RC" in ship-it. The beta and beta-cdntest channels download RC builds from the `candidates` directory, so this happens prior to pushing to releases (aka CDNs). Pushing to release users is covered by the Go-Live Checklist elsewhere.
  • product-details won't change You'll still see the last beta build in product details and on the downloads page; however, users already on beta will get the RC in updates.
  • WNP testing on release-localtest. RC week is when testing of the What’s New Page for the new release commences. This is done on the release-localtest channel by QA and a note will be made in trello once testing has been completed. It’s not necessary for every RC build to go through this testing as long as there has been a successful sign-off by the end of RC week.

RC week is also the time to finalize release notes and begin gathering feedback from the #release-notes Slack channel.

WNP Checklist

The What’s New Page has been something which has suffered from coordination problems in the past, since it requires contributions from Marketing, Localization, Web Development, and QA. A meeting should be held a few weeks prior to Go-Live to establish a timetable for the steps listed in the checklist.

Go-Live Checklist

Similar to the Beta and RC checklists, there are many common steps which have been previously covered above. Items specific to Go-Live are noted below.

Prior To Launch Day

  • Gather feedback for release notes. As noted in the RC Checklist section, the release notes will go throw review and revision by the UX and Marketing teams. Once the draft is ready to be shared, do so in the #release-notes Slack channel and then incorporate the revisions provided once ready.
  • Check for crash spikes with RC builds. We must verify that there are no obvious crash spikes in the pre-release data from the RC builds.
  • Schedule push to CDN (ship-it). This should be done on the day prior to Go-Live so that the release is staged on the mirrors and verified working prior to launch day.

Launch Day

  • Schedule push to release at 25% (ship-it). Go-Live time is usually 6am PT on launch day, but this can be done ahead of time with a scheduled rule change in Balrog.
  • Make release notes live. There is a 15-20min lag between making the change in Nucleus and the live website picking up this change, so plan to do this 15-30min prior to go-live.
  • Sign-off on scheduled rule change in Balrog. Assuming that the change is scheduled for 6am PT, this can be signed off ASAP to avoid unnecessary delays at go-live time.
  • Verify that new release is live on Verify that download requests are pointing to the new version. This can probably be moved to the delivery dashboard.
  • Email release-drivers & release-signoff that updates are live at 25%. Once the release is confirmed to be live, send an email to release-signoff & release-drivers confirming for that audience that the release has been pushed. Also confirm the rollout %.
  • Update tests on Release; WNP testing on Release. QA will send a sign-off email when this is completed.
  • Verify that the release notes are live.
  • Verify versions in firefox_versions.json. This can probably be moved into a step where we verify a number of things on the delivery dashboard.
  • Security advisories go live. Starting with 69 launch, release owner (from relman team) will own pushing the sec advisory live. This used to be handled by the security team post-launch.
  • Email announce list. Send an email confirming the new release, following the general form shown on the release wiki page.
  • Schedule Desktop update rate to 0% in Balrog after 24 hours. It is recommended to do this on launch day to avoid forgetting about it the day after. This change can be made in Balrog by either RelEng or RelMan, though both will need to sign off on the rule change afterwards.


  • (Launch Day +1) Verify Desktop update rate at 0% in Balrog.
  • (Launch Day +1) Email release-signoff & release-drivers to confirm 0% throttling. Once updates are confirmed to be throttled, email release-signoff & release-drivers confirming that the change is live. This can be a reply-all to the previous push emails to keep the history in one thread.
  • (Launch Day +2) Review release crash rates and incoming bugs for new blockers. There won’t be much new data yet two days after release, but any obvious crash spikes or critical regressions will likely be known.
  • (Launch Day +2) Bump Desktop update rate to 100% in Balrog. If there are no known quality issues, full rollout to the Desktop release population can proceed. Change the rollout value in Balrog and ping in the matrix channel to get RelEng sign-off of the rule change.
  • Email release-signoff & release-drivers to confirm full rollout. Once Desktop updates are bumped to 100%, email release-signoff & release-drivers to confirm. This can be a reply-all to the previous push emails to keep the history in one thread.
  • Ship new Desktop release in Ubuntu Snap Store. This can be done once the Desktop update rate is bumped to 100%. Documentation for managing Snap releases. (The ESR snap should not need manual intervention - it is handled in release warrior automation.)
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Dot Release Uplifts

Similar to the RC Uplifts tab. The primary purpose of this tab is to track any bugs driving a dot release, bugs which are under consideration to ride-along with a dot release if one is created, and to assess which products are affected by any drivers.

It is up to the release manager what should go into a dot release, and we try to keep these uplift guidelines in mind. Adding even what looks like a trivial fix can add risk, both to the process (delay, extra testing, work for other teams) and to causing new regressions. For security issues, we may not want to take them in a dot release unless there is particular pressure to do so.

Dot Release Checklist

The checklist for dot releases is essentially a combination of the RC and Go-Live checklists and the items should be treated mostly the same (except under chemspill situations where an accelerated time table may apply).

Of note, however, is the need for the release manager to email the release-drivers list prior to the creation of the builds (ideally shortly after the decision is made to go forward with the release) to notify all stakeholders of the forthcoming release. Also, the release manager should verify that the rollout percentages in Balrog & Google Play for the current release are set as expected (taking into account any blocking quality issues) to avoid unexpected fallback versions when the new release ships. Finally, if there are security fixes being included in the release, coordinate with the security team to ensure that they are aware of the bugs being fixed and can handle CVE assignments and security advisories.

Fenix releases

Process under development.

Focus releases

Process under development.