Dave Yeo has released (4/23/2012) a test build
of Firefox 10.0.4; it fixes the focus problems found in earlier builds,
but is known to have printing problems. SeaMonkey 2.9, Firefox 12.0,
and Thunderbird 12.0 have been released for the "tier 1" platforms; with
the shortage of developer time, it is unlikely we will see OS/2 builds
of these Gecko 12 applications any time soon.
Source. OS/2 Warp News and Rumors