Soft code freeze for Firefox 140 starts on May 22 @ 8am UTC
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Donal Meehan
May 19, 2025, 7:02:09 PMMay 19
to dev-pl...@mozilla.org, Firefox Dev
Hi,
With Firefox 139 in the Release Candidate phase this week, we are nearing the end of the Nightly 140 cycle
In order to avoid invalidating the testing we get out of late Nightly and to ensure that we can roll out Beta 140 to a wider audience with confidence this week, we'd like to ask that any risky changes be avoided from Thursday, May 22 until after the version bump to 141 on May 26.
Also, please be advised that string freeze for Firefox 140 begins Friday, May 23. In order to ensure that our localizers have adequate time to translate strings, please make sure that all string changes have landed by EOD Friday.
Some reminders for the soft code freeze period:
Do:
- Be ready to back out patches that cause crash spikes, new crashes, severe regressions
- Monitor new regressions and escalate merge blockers
- Support release management by prioritizing fixing of merge blockers
Do Not:
- Land a risky patch or a large patch
- Land new features (that affect the current Nightly version) — be mindful that code behind NIGHTLY_BUILD or RELEASE_OR_BETA ifdefs can lead to unexpected CI results
- Flip prefs that enable new Features that were untested in the Nightly cycle
- Plan to kick off new experiments that might impact a feature's merge readiness
Please let us know if you have any questions/concerns.
Thanks,
With Firefox 139 in the Release Candidate phase this week, we are nearing the end of the Nightly 140 cycle
In order to avoid invalidating the testing we get out of late Nightly and to ensure that we can roll out Beta 140 to a wider audience with confidence this week, we'd like to ask that any risky changes be avoided from Thursday, May 22 until after the version bump to 141 on May 26.
Also, please be advised that string freeze for Firefox 140 begins Friday, May 23. In order to ensure that our localizers have adequate time to translate strings, please make sure that all string changes have landed by EOD Friday.
Some reminders for the soft code freeze period:
Do:
- Be ready to back out patches that cause crash spikes, new crashes, severe regressions
- Monitor new regressions and escalate merge blockers
- Support release management by prioritizing fixing of merge blockers
Do Not:
- Land a risky patch or a large patch
- Land new features (that affect the current Nightly version) — be mindful that code behind NIGHTLY_BUILD or RELEASE_OR_BETA ifdefs can lead to unexpected CI results
- Flip prefs that enable new Features that were untested in the Nightly cycle
- Plan to kick off new experiments that might impact a feature's merge readiness
Please let us know if you have any questions/concerns.
Thanks,
Donal Meehan,
Firefox Release Manager
Firefox Release Manager
Donal Meehan
May 26, 2025, 10:31:26 PM (8 days ago) May 26
to dev-pl...@mozilla.org, Firefox Dev
The version bump to 141 has now landed on mozilla-central and the soft freeze period is over.
Thanks,
Donal Meehan,
Firefox Release Manager
Firefox Release Manager
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