Did ya follow through with the mozilla instructions (in mozilla.org) you
need to do a symbolic link to the java .so in /usr/share/mozilla-1.4x/plugins/
IIRC (more often than not it's IIRIC (InCorrectly))
That should be /usr/lib/mozilla-xxx/plugins, although I personally find it preferable to "mkdir /usr/lib/mozilla /usr/lib/mozilla/plugins" and then link the .so file in there instead.
It appears that mozilla (at least recent versions) will check that directory for plugins just fine, and you won't have to go re-linking every time you install a new mozilla.
-Bevan Bennett