Firefox 166 Release - Firefox Release Schedule - Nundina

Nundina › Discover calendars › Firefox Release Schedule calendar › Firefox 166 ReleaseFirefox 166 Release23 February 2027 at 14:00 UTCFirefox 166 Release: released to everyone on the Release channel. Planned for 2027-02-23 14:00 UTC.Firefox Release Schedule calendarMore from this calendar

26 October 2026 at 13:00 UTC - Firefox 160 Beta 1

27 October 2026 at 14:00 UTC - Firefox 159 Release

3 November 2026 at 14:00 UTC - Firefox 159 Dot Release 1

4 November 2026 at 00:00 UTC - Firefox 161 String Freeze

5 November 2026 at 16:00 UTC - Firefox 161 Merge Day