Rich Walsh has released (2/10/2011) test builds of Firefox v4.0b12pre and Seamonkey v2.1b3pre
that include printing support; be sure to read the included
printing.txt for more information. These releases also use Exceptq v7.1
to generate debugging reports should the app crash, improvements to the
memory management that should decrease problems with shared memory, and
hardware acceleration using DIVE.
Source: OS/2 Warp News and Rumors