Nundina › Discover calendars › Firefox Release Schedule calendar › Firefox 164 Merge DayFirefox 164 Merge Day7 January 2027 at 16:00 UTCFirefox 164 Merge Day: code moves from Nightly to Beta (Nightly becomes the next version). Planned for 2027-01-07 16:00 UTC.Firefox Release Schedule calendarMore from this calendar