Firefox text not centered in boxes

[Jonathan Ryshpan]

Often web pages include a graphical box in which some text is supposed
to be displayed.  And very frequently Firefox does not center this text
in the box vertically.  The easiest place to see this is in Google maps,
where the texts "Map", "Satellite", and "Hybrid" are way below center in
their boxes, part of the text appears outside the box on the bottom, and
the very bottom part of the text is not displayed at all.

Has anyone else noticed this?  Does anyone know a cure?

Thanks - jon