Soft code freeze for Firefox 148 starts on Thursday, January 8 @ 8am UTC Hello, With Firefox 147 in the Release Candidate phase this week, we are nearing the end of the Nightly 148 cycle In order to avoid invalidating the testing we get out of late Nightly and to ensure that we can roll out Beta 148 to a wider audience with confidence next week, we'd like to ask that any risky changes be avoided from Thursday, January 8 until after the version bump to 149 on Monday, January 12. Also, please be advised that string freeze for Firefox 148 begins Friday, January 9. 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