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Release DateFebruary 14, 2023
Release OwnerPascal Chevrel
Nightly cycle length5 weeks
Beta cycle length4 weeks
Bugs fixed in Nightly 1231
Current Beta 110.0b6
Corresponding ESR release 102.8.0
Milestones
Nightly starts

The first day of the cycle is Merge Day. After merging mozilla-central to mozilla-beta, we bump the Nightly version number on mozilla-central and a new development cycle starts for Firefox. A new Firefox Nightly is shipped every 12 hours.

December 12
Soft Code Freeze starts Draft beta release notes

We are nearing the end of the Nightly cycle. Don't land new untested features. Risky changes should be avoided after 8:00 AM UTC until after the nightly version bump on Merge Day.

January 12
String Freeze starts

In order to ensure that our localizers have adequate time to translate strings, please make sure that all string changes have landed by end of day.

January 13
Merge day

This is the day in the release cycle when we merge mozilla-central into mozilla-beta. This is the end of the development cycle for Firefox 110 and the beginning of our Beta stabilization cycle.

January 16
Beta 1 Go to build

Built manually just after the merge. It is rolled out to 25% of our beta population. Some experimental features are still activated to watch their behavior on a wider population. These experimental features will be deactivated mid-cycle. Uplift requests are open.

January 16
Beta 2 Go to build

First automated beta of the cycle. It is rolled out to 50% of our beta population. Build starts at 21:00 UTC.
Stabilization work via uplifts.

January 17
Beta 3 Go to build

Beta rollout bumped to 100% provided stability is good. Build starts at 21:00 UTC. Stabilization work via uplifts.

January 19
Support content creation

User affecting changes were identified and provided to the support.mozilla.org team. The support content for this release can now be created and will be translated before RC week.

January 20
Beta 4 Go to build

Build starts at 21:00 UTC. Stabilization work via uplifts.

January 22
Beta 5 Go to build

Build starts at 21:00 UTC. Stabilization work via uplifts.

January 24
Beta 6 Go to build Last early beta

On a regular 4 weeks beta cycle, Beta 6 is the last beta with experimental features still activated. Build starts at 21:00 UTC. Stabilization work via uplifts.

January 26
Beta 7 Go to build

Experimental features are no longer activated at compile time. Build starts at 21:00 UTC. Stabilization work via uplifts.

January 29
Support content localization

New content on support.mozilla.org team is finalized, uploaded to the server and provided to our localization teams internationally.

January 30
Beta 8 Go to build

Last week of the beta cycle. Build starts at 21:00 UTC. Stabilization work via uplifts.

January 31
Beta 9 Go to build Last beta uplifts

On a regular 4 weeks beta cycle, this is the last beta and thus the end of beta uplifts. Build starts at 21:00 UTC.

February 2
Release Candidate Go to build

We merge our mozilla-beta repository to mozilla-release and close mozilla-beta until the next merge day. We then build our Release Candidate from mozilla-release. This is the build we intend to ship a week later unless we need to build a second Release Candidate to fix a major quality or business critical issue.

February 6
Release Candidate Release notes finalized

Our Release Candidate is shipped to all of our beta population.

February 7
Release day!

We ship Firefox 110 at 14:00 UTC (6AM PST) at 25% rollout.

February 14
Planned dot release

Two weeks after the release, we ship a dot release to address identified quality issues if needed. We may have to ship other dot releases before that date. If this is the case and post-release quality issues are already fixed and shipped, the decision on shipping or not the planned dot release is on the release management team.

February 28