The Firestorm team have announced that version 18.104.22.168720 of the Firestorm viewer will be blocked from accessing Second Life and OpenSim starting on Thursday April 10th.
According to statistics from Linden Lab, there are some 5,500 people still using Firestorm 22.214.171.124720, which lacks support for many significant features, including Sever-side Appearance, Materials Processing and Fitted Mesh. Nor does it include support for many of the server / viewer improvements released over the course of the last year, including interest list updates and HTTP improvements.
Those people still running 4.4.0 are being strongly urged to update their Firestorm viewer to 4.4.2 or later prior to the block commencing on Thursday (no actual time is given in the blog post). Those already running 4.4.2 or later need not take any action – this does not affect you.
The block is being implemented as a part of Firestorm’s policy to, as far as is possible, only have three active versions of the viewer accessing Second Life at any given time. Unfortunately, OpenSim is also affected as the team do not currently have the means to selectively block older versions of the viewer from accessing individual grids at this time. However, this is expected to change when the time comes to block another release in the future.