>Site change,
>
>I need to be admin to update FF, and I have not done this yesterday. The change was in your morning, and changed other stuff too, for example the link in my signature was misaligned before this change.
>
>Except that the font is ugly, nearly monospaced, anything else is aligned properly.

Just fire up FF's inspector and find out that the current font for this style is set to "Calibri,Arial,Helvetica,sans-serif", in the page itself (i.e. not in a .css).