sambaliz:
I've updated Firefox and Java, and did it again just to make sure, Java is enabled, and still no Griddlers. I'm not getting a black screen, I'm not getting that blocked plug-in error, I just get a blank page.
In the website news glllop said that updating Firefox started all the troubles. Maybe it is relevant to you too. Read what I suggested to glllop to do:
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I found a link to go back to previous FF versions.
Look here:
http://support.mozilla.org/en-US/kb/install-older-version-of-firefox
The recent version is 19. In the website above you can have version 18, 17, 16.
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Try it!