In the browser you can also check your plugins with the url.
All plugins go in the Plugins directory where your browser is installed.
For java make a soft link to your java plugins like so.
ln -s /usr/lib/java/jre/plugin/i386/ns610-gcc32/libjavaplugin_oji.so libjavaplugin_oji.so
Add flash plugin to that fdirectory as well.
And gxineplugin.so Gxine or xine is a good multimedia player.