Typesetting of help output in notebook?

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I am busily getting a brand new ubuntu 12.04 installation up and running, including sage 6.0, which I compiled from source. The only problem I currently have is that in the notebook (running in firefox), outputs of help are not properly typeset: there's overwriting and in general it's impossible to read. I have a java plugin installed (which "about:plugins" shows is there and enabled), and mathematics output displays fine - it's just the help output which doesn't display properly.

What do I need to do to fix this?