The Mozilla Developer News weblog has posted the schedule for Mozilla Firefox 1.5 Beta, with Firefox 1.5 Beta 1 scheduled for release on Thursday 8th September. In preparation for the release, the tree will be locked down at 11:59pm Pacific Daylight Time (UTC -0700) on Tuesday 6th September. During the lockdown, no further checkins will be accepted for 1.5 Beta 1.