how-to block ads
and then make the symlink from /opt/blackdown-jre-1.3.1/plugin/i386/mozilla/javaplugin_oji.so to /usr/local/mozilla/plugins. It should then work. However if you want to have the latest mozilla build then do...
and download the nightly build from the Mozilla website. Then make the symlink. The emerge -o mozilla will download all the dependencies needed including Java, to run Mozilla. Finally inject mozilla into your portage tree so that portage knows you installed it.
and you should be all set.
This will not work in Gentoo 1.4-RC1