Java Console 7.0.01 is incompatible with Firefox 7.0.1
As shown on the Firefox Add-on, Java Console 7.0.01 is not compatible with Firefox 7.0.1 and is not enabled.
Todas as respostas (1)
Look here the solution chosen and James reply just below:
https://support.mozilla.com/en-US/questions/861953
thank you