Headers display mode - where's that preference?

Hi, I'd like to change my header disply mode from the one you can see
in Fig. 1 to the one in Fig. 2 (the one by default). But I can't find 
any preference related.

How was it change? I don't know... I think it was changed by itself
after a Mozilla crash.

One of the problems I got with this old-style headers display mode is 
that I cannot have access to attachments! :-(

Thanks in advance.

PS: Please could you send CC of your replies to
[email protected] ?


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     - Manuel Casal Lodeiro -
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