If you prefer the online version of firefox as the one from repository ,

the sun-java5-plugin from repository would not work any more

so you have to install it at lease and do following.

ln -s /opt/jdk1.5.0_11/jre/plugin/i386/ns7/libjavaplugin_oji.so
/path_to_firefox_installation/plugins/

to check the result just type

about:plugins

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