Rich Walsh has released (4/14/2010) a test build
of Firefox 3.7a4pre, which features a few OS/2 specific improvements:
scrolling should require 25-50% less CPU usage than previously; less
memory use for new tabs; users of Matrox video drivers should see a
normal display; FlashBlock will no longer show a floating rectangle.
Source. OS/2 Warp News and Rumors.