Firefox javaplugin insists on symlinks

If you were wondering why your java plugin doesn't work, it might be because
you copied

libjavaplugin_oji.so

instead of creating a symlink to it:

ln -s /javapath/jre/plugin/i386/ns7/libjavaplugin_oji.so \
$HOME/.mozilla/plugins/.

Not sure why it works only that way.