In case this helps resolve the issue for you:
$ sudo update-java-alternatives -s java-6-sun
I suspect that the following is not required, but I had run that also:
$ sudo update-alternatives --auto firefox-javaplugin.so
In case this helps resolve the issue for you:
$ sudo update- java-alternativ es -s java-6-sun
I suspect that the following is not required, but I had run that also:
$ sudo update-alternatives --auto firefox- javaplugin. so