My firm experience is that the default 64 bits Java-plugin for Firefox… does not work properly. The plugin uses the GNU’s famous Java VM…
I have testet the plugin here… and it does not show any signs of life.
I suggest that you replace the GNU’s GCJ Java-plugin with the IcedTea Java implementation. IcedTea is based on SUN’s OpenJDK Java and class libraries…
I agree, many strange names here.
1) Edit your /etc/apt/sources.list file
$ sudo gedit /etc/apt/sources.list
# add these repository lines to that file. (you can browse the files here…)
deb http://people.ubuntu.com/~doko/ubuntu/ gutsy/
deb-src http://people.ubuntu.com/~doko/ubuntu/ gutsy/
Install the plugin
$ sudo apt-get install –reinstall icedtea-java7-plugin
$ killall firefox-bin