With Firefox 77 RC shipping soon, we are nearing the end of the Nightly 78
cycle.

In order to avoid invalidating the testing we get out of late Nightly and
to ensure that we can roll out Beta 78 to a wider audience with confidence
next week, we'd like to ask that any risky changes be avoided from Thursday
May 28 until after the version bump to 79 on June 1st.  This also means
that by mid-week, feature work targeting 78 should be complete and ready to
ride the trains.

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,
Julien & the Release Management team
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