So, a few weeks ago, Ubuntu “upgraded” Firefox 2.0.0.12 (which is a decent release) to Firefox 3 Beta and I couldn’t view any java applets any more. The reason is because some of the file paths are changing and the plugins need to be linked to a different spot. I had to try Opera but it crashed. That left me with Konqueror, which is not native to Gnome, for the time being.
That has just changed. I just found Bug #173966 and there was a hack proposed that helped me to get back on track. The solution, for now:
cd /usr/lib/xulrunner-addons/plugins/
ln -s /usr/lib/firefox/plugins/libjavaplugin.so . <–note the “dot”
Your plugin path might be different, but that’s where one place mine can be found (actually, its a symbolic link to the plugin, which is in /etc/alternatives/firefox-javaplugin.so)