Official builds of Firefox version 3.6.11 (10/18/2010) and Thunderbird version 3.1.5
(10/17/2010) have been released. As with previous 3.x Firefox builds,
there are some known issues (particularly with printing); Java support
is also no longer available. There is a build of Lightning for Thunderbird 3.1.x, which adds calendar support. See my Warpzilla tips page for more information.
Source: OS/2 Warp News and Rumors