digitei 'about:plugins' e o java instalado é
GCJ Web Browser Plugin (using IcedTea) 1.4
Nome do arquivo: gcjwebplugin.so
The GCJ Web Browser Plugin (using IcedTea) executes Java applets.
Tipo MIME Descrição Sufixos Ativo
application/x-java-vm IcedTea class,jar Sim
application/x-java-applet IcedTea class,jar Sim
application/x-java-applet;version=1.1 IcedTea class,jar Sim
application/x-java-applet;version=1.1.1 IcedTea class,jar Sim
application/x-java-applet;version=1.1.2 IcedTea class,jar Sim
application/x-java-applet;version=1.1.3 IcedTea class,jar Sim
application/x-java-applet;version=1.2 IcedTea class,jar Sim
application/x-java-applet;version=1.2.1 IcedTea class,jar Sim
application/x-java-applet;version=1.2.2 IcedTea class,jar Sim
application/x-java-applet;version=1.3 IcedTea class,jar Sim
application/x-java-applet;version=1.3.1 IcedTea class,jar Sim
application/x-java-applet;version=1.4 IcedTea class,jar Sim
application/x-java-applet;version=1.4.1 IcedTea class,jar Sim
application/x-java-applet;version=1.4.2 IcedTea class,jar Sim
application/x-java-applet;version=1.5 IcedTea class,jar Sim
application/x-java-applet;version=1.6 IcedTea class,jar Sim
application/x-java-applet;version=1.7 IcedTea class,jar Sim
application/x-java-applet;jpi-version=1.7.0_00 IcedTea class,jar Sim
application/x-java-bean IcedTea class,jar Sim
application/x-java-bean;version=1.1 IcedTea class,jar Sim
application/x-java-bean;version=1.1.1 IcedTea class,jar Sim
application/x-java-bean;version=1.1.2 IcedTea class,jar Sim
application/x-java-bean;version=1.1.3 IcedTea class,jar Sim
application/x-java-bean;version=1.2 IcedTea class,jar Sim
application/x-java-bean;version=1.2.1 IcedTea class,jar Sim
application/x-java-bean;version=1.2.2 IcedTea class,jar Sim
application/x-java-bean;version=1.3 IcedTea class,jar Sim
application/x-java-bean;version=1.3.1 IcedTea class,jar Sim
application/x-java-bean;version=1.4 IcedTea class,jar Sim
application/x-java-bean;version=1.4.1 IcedTea class,jar Sim
application/x-java-bean;version=1.4.2 IcedTea class,jar Sim
application/x-java-bean;version=1.5 IcedTea class,jar Sim
application/x-java-bean;version=1.6 IcedTea class,jar Sim
application/x-java-bean;version=1.7 IcedTea class,jar Sim
application/x-java-bean;jpi-version=1.7.0_00 IcedTea class,jar Sim
obrigado