kenjo, until bug #173966 is fixed, to get sun-java6 plugin working, you'll need to manually link /usr/lib/jvm/java-6-sun/jre/plugin/i386/ns7/libjavaplugin_oji.so as /usr/lib/xulrunner-addons/plugins/libjavaplugin_oji.so.
$ ln -s /usr/lib/jvm/java-6-sun/jre/plugin/i386/ns7/libjavaplugin_oji.so /usr/lib/xulrunner-addons/plugins/libjavaplugin_oji.so
kenjo, until bug #173966 is fixed, to get sun-java6 plugin working, you'll need to manually link /usr/lib/ jvm/java- 6-sun/jre/ plugin/ i386/ns7/ libjavaplugin_ oji.so as /usr/lib/ xulrunner- addons/ plugins/ libjavaplugin_ oji.so.
$ ln -s /usr/lib/ jvm/java- 6-sun/jre/ plugin/ i386/ns7/ libjavaplugin_ oji.so /usr/lib/ xulrunner- addons/ plugins/ libjavaplugin_ oji.so