Official builds of Firefox version 3.6.15 and Thunderbird version 3.1.9
have been released (3/5/2011). 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