Firefox fonts too small

[Torquil Macdonald Sørensen <torquil@gmail.com>]

Hello, anybody know why the fonts size setting in Firefox needs to be 
artificially high, i.e. much larger than the apparent size of the font it 
actually uses in web pages?

I typically use font size 10 all over KDE and for GTK-apps, and this is also 
used on the Firefox menu. But for some reason, a font size 9 (which I have 
set as the minimum size) in firefox seems to correspond to something around 
half as large as my font size 10 elsewhere (KDE, Firefox menu,...)

I have layout.css.dpi=0, and have not ticked the "Allow pages to choose their 
own fonts..." in the Firefox preferences. I have also tried 
layout.css.dpi=-1, but that made no difference.

Mvh
Torquil Sørensen