Soft code freeze for Firefox 137 starts on February 27 @ 8am UTC

Hi,

With Firefox 136 in the Release Candidate phase this week, we are nearing the end of the Nightly 137 cycle

In order to avoid invalidating the testing we get out of late Nightly and to ensure that we can roll out Beta 137 to a wider audience with confidence this week, we'd like to ask that any risky changes be avoided from Thursday, February 27 until after the version bump to 138 on March 3.

Also, please be advised that string freeze for Firefox 137 begins Friday, February 28. 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
Pascal Chevrel
Firefox Release Manager

The version bump to 138 has now landed on mozilla-central and the soft freeze period is over.

Thanks,